The 24-year-old arrived at the Hawthorns in the middle of the 2009/10 season from French outfit Paris Saint-Germain and enjoyed an impressive campaign last term.
However, the DR Congo international and told The Guardian: "Albion have given me a big opportunity and I don't want to disrespect the club.
"I don't think it's a good thing when you make just one good year and go. For the moment, I'm thinking only about Albion.
"I'm proud of what I have done so far - I think I've done well. But it's big pressure now because I need to do the same again."