He said: "Fabrice has had a terrific impact. He is a good player and I think he can get better and better.
"But what he has got to do is what he didn't do for us on Saturday - and we have spoken about it already - he has got to add goals to his game and he has got to add a little bit of forward momentum to his game.
"He is exceptional at what he has been bought for, but if he wants to get better, he has got to add to that, and I am sure he will do.
"He is a great lad and he is going to be a top, top player."