The ex-Bolton boss has an army of background staff that look at all aspects of the game.
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Sam Allardyce: "Dr Mark Nesti is a clinical psychologist. He's not a sports psychologist, he is miles better.
"He is there for the players and I promote him because of the great faith I have in the work he has done.
"In football terms, the difference between a Premiership player and all the other divisions is his mental state, his mental agility or his decision-making process.
"Premiership players' skills are sometimes no greater than players below them in different leagues, but they can play in the Premiership because they can cope better mentally.
"By giving no coaching on that, you undermine the potential of your players.
"In that area, Dr Nesti is one of the best. He is one of the most qualified men I have ever met. He is a magic guy at what he does."This country has a far too negative view on psychology. We fall way behind a lot of countries in that respect.
"It is a very big part of football - the most important part. What goes on between the ears is what makes you as good as you are as a player.
"I wouldn't tell you if Michael Owen has seen him, it is purely confidential between those two people. I cannot breach that confidentiality.
"We have two players who have had what I consider a life-changing experience of the doom and gloom that serious injury brings.
"The depression comes over you wondering day by day whether you are ever really going to get better. Will you ever really be the same?
"There are lots of players who take more comfort from a religious point of view. That is the way forward perhaps psychologically.
"Religious faith can be what they can turn to . . . and that is a great help. We have got David Tully, the club chaplain, working on that, and I had a chaplain at Bolton who did terrific work in a similar area.
"Marrying them (psychology and religion) together is a fantastic opportunity to relieve yourself of what problems you may have.
"Generally, a player's problems don't lie inside the football club. Generally the problems lie outside.
"To have someone to help them with those problems without anyone getting to know about them can only be a wonderful thing.
"We've got the best background team in the country.
"When I started down this route eight or nine years ago, people used to laugh at me. They used to say: 'Look at that big, daft devil. What's he doing that for?' They tried to make a mockery of me.
"Now, I sit in this position as a very successful manager. My beliefs have been proven by results.
"What made me go down that route? Ground-breaking ideas. Ideas like a cryogenic therapy unit - we had the first one in the country at Bolton.
"It promotes recovery after training. You can then train the players longer and harder than ever before.
"We were the first to get that sort of science in. You are only looking for one per cent or half a per cent to make players better.
"If you can give that player that bit more support then he is going to fight to give you that bit more back when he goes out onto the field.
"That is the fine line between winning and losing."