Speaking at a Q+A at the Laureus World Sports Awards in Monaco, the Frenchman said: "You want to buy the same kind of player than Ozil you have to spend £100m.
"To retain the value of the player beyond the Ozil case, it’s more about the way football is structured nowadays.
"To buy players of top, top quality you need £100m.
"So the decision you always have to make is: 'Do we extend the player who cost us nothing, a top-class player? Or do we have real money to buy a player?'
"It’s not much less expensive and you spend that kind of money."
Mesut Ozil is refusing to leave Arsenal after being told by Unai Emery he is not wanted