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, but Lambert says that neither party has pushed for negotiations to begin.
Lambert said: "I think the most important thing is the league until the end of the season, I heard somebody say he's been promised a new contract but I can't have been a part of those conversations.
"I speak to him all the time, not about contracts, I just tell him to keep it going really. And he's never once mentioned anything to me about contracts.
"He's got a contract here anyway as it stands, but I think it's important we stay in this league and do as well as we've been doing.
"As I said before I've never had one conversation with him regarding contracts or anything like that, he's not that type of lad.
"I'm sure come the end of the season we'll sit down and it'll be just Chris and a few others."