The Frenchman said: "You can see his match fitness is not completely there yet. I believe physically it will take him another 10 days.
"I'm convinced he will soon have a tremendous influence on our game because he has a quick brain and is many steps ahead of the game.
"Even on Saturday he set up two great chances for Robin van Persie. They were two great passes and he had two great opportunities too.
"When you can have that kind of impact on a game, it is very positive."