The World Cup is a competition in which everything needs to work to your advantage. Players need to be fit, decisions have to go in your favour, and details such as a red card can cost a team dearly.
Every player needs to be aware of the levels of fitness needed to play international cricket.
If you are not playing a player, any player, for two, three, four games, then you don't have to give a reason for that. But if it gets to eight or nine games, then you have to explain the situation. What's going on?
The rotation system at Bayern makes it nearly impossible to play week after week, even when you're putting in some top performances.
The training at Tottenham is intense, but the structure is set out perfectly - in the gym, running, sometimes double sessions. Every player at Tottenham is in great shape.
Do you think that a Franck Ribery can always expect to play? No. When he is not on form, he will not play.
My saddest decision in football was leaving Paul Gascoigne out of the 1998 World Cup finals. But he wasn't fit enough and once that decision is made, as a manager and a group of players, you forget about who isn't there and focus on the job.
It's up to the coach to decide who is in the best shape to play each match.
To be a striker you need to be in good shape.
For every player, it is important to be fit and have a good pre-season behind him.
Nothing is more important to England's arrangements for the World Cup than the state of David Beckham's foot.
I watch a lot of football and you hardly ever see Premier League players go down with cramp. The fitness, the intensity of Premier League football is phenomenal.
Messi never wants to be subbed off, but it's my task to take care of him.
The type of game I play, I'm going to pick injuries and suspensions, unfortunately.
If we are going to win games, we need 11 fit players. Sir Alex Ferguson does not pick half-fit players.
When you make your final list for the World Cup or European Championship you don't take the 23 best players, that is for sure.
As a player, you want to play for your national team - if you're fit, you play; if you're not fit, you don't play.
Welbeck will be the main man and I have no doubt he will flourish. Imagine the pace Arsenal will have when everyone is fit.
You need to have a big squad; it's important when you're in the Champions League, with the amount of games we've got.
When it comes down to it, it's about putting the players on the field that will be the best 11.
Whether a player rotates more or less depends on his form and his position. It's not the same for a center back as it is for a winger. Every player is different.
I think the fitness of players is the key to success. I believe that there should be no place of unfit players in the team because the fit players also start becoming lazy seeing their routine. Having teamwork capabilities is also very important as there comes a lot of times where you have to think beyond your own interest to upkeep the national interest.
At this level, if you are aiming for the World Cup, because the tournament is so long there will be points where the team may lose a couple of games.
We have to look after the health of the players. Quality suffers with too many games.
Managers now don't just use 11 players; they have to care about all the squad of 25 or more players.
