"I am probably 50/50 but I am fairly confident I should be all right - I am optimistic," he told the Hammers official website.
"When I first did it I didn't think it would be that bad, I thought it would be a week at the most.
"But since then it did get a bit sore afterwards, and it has dragged on a little bit longer as groin injuries can do.
"It was very frustrating - but it happens, and I just have to deal with it."