Arsenal boss Arsene Wenger has revealed his approach towards his team selection before every fixture.
Frenchman Wenger says he is never totally decided on which Arsenal XI to field until the match day and that he likes to mix his intuition with science when it comes to his final selection.
"I always have eight or nine players of my team in my head the day before the game, but there's always a doubt on one or two," Wenger told the Arsenal Magazine.
"You try to make it as scientific as much as you can, but it's intuitive as well because you have to think if the balance of the team is right or if one player was a bit better in the last training session.
"Has one player got a bit of a cold maybe? When two players are together in your mind, competing for one position, every single detail can go for one of them - experience, confidence under pressure - everything can make a difference.
"I always have a final chat with the medical people to make my mind up and make sure that everybody is alright. I do that on the morning of every game. Then I make my decision.
"You always have your team in your head, for the whole week. You never go to bed without thinking about what the next line-up will be.
"You live with that always. That can create uncertainties, because you think about it every day. If you don't know on Friday night, you will not know on Saturday morning so you have to decide in your head early, and go for it."
The third-placed Gunners next play fifth-placed Liverpool in a vital Premier League clash on Saturday at the Emirates Stadium.
