There is something about a cup final that brings out a different quality in a footballer. Do they have the courage to win a one-off match?

There were players I shared a dressing room with who didn't like each other. You don't have to talk to each other. You just need to win matches.

To go and watch Manchester United, whether it's home or away, is entertainment; it's goals - whether you concede goals or whether you can score goals.

Modern managers have a lot of demands on them, and many feel, with justification, that they do not have the time to commit to watching the junior sides.

English clubs should not be pleased to go to places like Barcelona and get away without a thrashing. They should be able to compete. They have the resources.

As a finisher, there are few players as composed as Messi. When you can score as many different kinds of goal as he can, you have every reason to be confident.

I think about the great players with whom I have shared a pitch: Eric Cantona, Zinedine Zidane, Pirlo, Xavi, Cristiano Ronaldo - and the greatest of them all is Messi.

When it came to playing Arsenal over the last eight years of my career at United, we always went into games against them feeling like we would win - and we usually did.

I knew the shirt-swapping business in general was getting out of hand when opponents would ask me for my shirt while we were still mid-match. Those are the wrong priorities.

As a striker, as I originally was, and then an attacking midfielder, it has always been my aim in life to embarrass goalkeepers: to dominate them, to force them into mistakes.

When I finally quit for the second time in the summer of 2013, I had accepted that this really was the end, and, having got over that, the move into retirement was a lot easier.

As players, we were paid to do a job we loved - in my case, at the club I supported. And nothing I did could be allowed to interfere with that. The manager would not have permitted it.

For any footballer who plays for Real Madrid in the modern era, the prospect of leaving the club must feel like a step down no matter where they go - but it does not have to be like that.

I don't go looking for the post-match team pictures posted by players on Instagram, but usually, someone ends up showing them to me, or I notice them when they get printed in the newspapers.

I was lucky enough to play at Old Trafford, and we always talked about the atmosphere on a Tuesday night, the special atmosphere you create, and the crowd is rocking when you go out for a warm-up.

I suppose I should have realised that the very fact I was still playing for United at 38 years old was a sign that there was not enough pressure on us senior players from those coming into the side.

OK, so I never had a transfer in my career, but I used to love deadline day: Dimitar Berbatov turning up at Manchester airport with hours to go, Robinho coming to Manchester City instead of Chelsea.

I first remember Wayne Rooney from a game at Old Trafford in 2002 when he came on as a late substitute for Everton and, in a brilliant 15-minute performance, skipped past me on a couple of occasions.

The best goalkeeper I played with at United was Schmeichel. He was a phenomenon in training, never mind on match days. He just never wanted to concede, and he would do everything to stop you scoring.

You have to be careful when you time a move to one of the biggest clubs. Occasionally, these young players do not realise what a good thing they are on to when they know that they will be playing every week.

Let me tell you what it is like playing against Messi. You are up against a footballer who can take the ball either side of you, and you have no idea which side that might be from any hint about his body-shape.

St James' Park was always, in the course of my career, a great place to play football, for the wildness of the crowd and the no-holds-barred football that both my team, Manchester United, and Newcastle would play.

It's the thing I miss about football, I suppose: being with the team day-in day-out, getting a team ready for a Saturday afternoon, or getting yourself ready for a Saturday afternoon - it's the most difficult part.

'Elusive' is the word that immediately springs to mind when I think about Messi's style of play. You think you have an eye on him and then - blink - he has gone, only to reappear somewhere else in space, with the ball.

If you go down the leagues, you have to understand what level you're working with, and if you get frustrated, then it's not going to ever happen for you. That's why a lot of managers don't succeed where they should do.

My view is that the signing of players should be a simple process. The chief scout identifies them, the manager decides who he wants, and the chief executive is dispatched to do the deal. It really is as simple as that.

Saturday afternoon is the hardest thing. I can go out and watch games, but I'm constantly on my phone looking at results: what score is this, what score is that. You have no real involvement, but you're obsessed with it.

My view is that you show Messi one side or the other, and if he goes past you, he goes past you. But if he slips it through your legs, then you have to obstruct him and take the foul. Just don't ever let yourself be nutmegged.

Messi is as famous as any footballer has ever been, and yet, when it comes down to it, we don't know much about him. I read that he is a family man and likes to walk his dogs, but beyond that, he's a mystery, really. I like that.

On my mum Marie's side, my nana was from the Republic of Ireland, and my granddad was from the north. Lots of families in Manchester have strong Irish connections, but it never occurred to me to play for anyone other than England.

I was fortunate to play with so many wonderful footballers and under the greatest manager of all time, but I do believe that a club's ethos, the principles of how it plays, should outlive even the biggest individuals in its history.

When you are playing for a top club, when the pressure is on, when scrutiny is everywhere, you need some privacy. You need a place away from public view where people can be open, and, at times, difficult conversations need to be had.

Playing against Messi, as I've said before, is as tough a test of your concentration as any in football. At any moment, he can take the mickey out of you. Physically, it is demanding, but mentally even more so. You cannot switch off.

Pirlo is a cool customer who does things in his own time. On the pitch, he just looks so relaxed, no matter what is going on around him. He is one of those greats who looks like he could run a midfield with a glass of red wine in one hand.

As a player, I loved being tackled, whether it was in training or in a game. I took a full-blooded challenge as an invitation to do exactly the same thing to an opponent. I would wait for my opportunity and nine times out of 10, I would get him back.

I won three FA Cup finals, two League Cup finals, and played in one of United's two Champions League-winning finals. But I lost in a lot of finals, too: the FA Cup in 1995, 2005 and 2007, the League Cup in 2003, and the Champions League in 2009 and 2011.

From United's point of view, it is always difficult to tell just when a young footballer is going to mature into a first-class professional ready to play at the highest level, but the story of how Pogba slipped away from United has more than one strand to it.

It goes without saying that no one at United ever expected any help. We understood that decisions can go against you. We believed we were the better team, and therefore, if the referee got his decisions right, then we would win the vast majority of our games.

When I watch Jurgen Klopp's Borussia Dortmund side, I see a manager who is determined to play in his opponent's half, who is committed to attacking football, and, from the way he conducts himself on the touchline, is clearly an interesting, charismatic personality.

In my years at United, I witnessed some signings who, over their careers, transformed the fortunes of the team. From Eric Cantona, when I was an apprentice, to Dwight Yorke, Ruud van Nistelrooy, and Wayne Rooney. These were great footballers who became great United players.

In the periods of my career when I stopped passing the ball forward or when I stopped looking for the risky pass that might open up a defence, the consequences were the same. The manager stopped picking me. I got back into the team when I went back to doing it the way he wanted.

United fans don't care if the team only has 40 per cent possession as long as they are watching an attacking team. My experience was that the supporters understood that even our best teams, even the teams with Peter Schmeichel or Edwin van der Sar in goal, were going to concede goals.

Part of being a Manchester United player under Sir Alex Ferguson, perhaps the most important part of being one of United's attacking players was that when you were in possession, you had to take risks in order to create goal-scoring chances. It was not an option; it was an obligation.

As a midfielder at United, I had to pass the ball forward, and yes, it did not always work. It did not always mean putting a chance on a plate for the strikers. It was up to them to get on the ball and score goals. Was it easy? No, but we were playing for United. It was not supposed to be easy.

Little details about young footballers catch your eye when you have been around a big club for a long time. At first, it can be minor things, like the way certain young players stand out from the group when the academy lads cross paths with the senior team on their way to training in the morning.

If you want a measure of how private a place the dressing room was when I was growing up at Manchester United, consider this: even Sir Alex Ferguson would knock before coming into the dressing room at the Cliff, the old training ground. The dressing room is for the players - and the players only.

There is no doubt that my former manager Sir Alex exerted an influence over some referees. He was the master of dropping a comment into his Friday press conference - for instance, how long it had been since we had been given a penalty, or the treatment meted out to a player like Cristiano Ronaldo.

I worked with many great assistants to Sir Alex Ferguson over the years. Yet sometimes a manager's second-in-command is more suited to that role than any other. You confide in them - you tell them things that you would not tell the manager - and they are that bridge between the boss and the players.

The first time I retired, only Sir Alex Ferguson and I knew that the last league game of the 2010-11 season against Blackpool was to be my final game at Old Trafford. I was a little bit sad, but I am not one for tears. The end of a career comes to us all, and there is not a lot you can do about that.

At United, my United, we had been honed into a ruthless team who played great football but, ultimately, were there to win football matches and league titles. At Newcastle, they could certainly play on their day, and the crowd was formidable, but there was a weakness - a vulnerability that you could seek out.

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