The 22-year-old Belgian's goal against Stoke last weekend nudged him a step closer to becoming the first Villa player to score 20 league goals in a season since Peter Withe 32 years ago.
Lambert said: "If you have to go back that far it shows how good he's been. Nobody visualised he was going to do what he has when he first came in, but the big guys been fantastic.
"He's the one that does it, he's the one that plays the game, he's the one that goes out there every week and he's been a credit to himself and to the football team - that's the main thing. I'd like to see him continue doing what he's been doing and as for the rest we'll see what happens."