The striker signed for the Hammers to January this week.
"If I'm doing the business and doing well and making a difference in the team, we are in good shape and the manager and the Chairmen want to keep me on, I'll always be available and hopefully we can crack on after that," he told West Ham TV.
"I've always wanted to prove myself and hopefully, with this second chance at West Ham, I can help the team. That's all I want to do. I want us to stay in the top league where we deserve to stay."
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