The striker comes off contract in June.
He told the Daily Mail: "I know what I want in my life, there's a lot of stuff that can happen from now until the end of the season but it's still open. Mr Sullivan and Mr Gold (West Ham's owners) are going to speak about everybody's future once we know where we are in the league. It's a bit premature at the moment.
"When we know where we are then we can close that deal. If I'm not going to close that deal at West Ham I might close it somewhere else. I've got to weigh up my options."