Arsenal boss Wenger: Walcott must play in attack
He said: "Next season we will play the formation and system that most suits the players and the balance of the team.
"That means it's not rigid. It can evolve throughout the season, depending on circumstances and personnel.
"If you play with Theo Walcott for example, you are more tempted to go for three midfielders because Theo is more of a forward than a midfielder in a 4-4-2."