Maiga has not scored for 10 months.
Hammers boss Sam Allardyce said: "He's struggling because he's not scored.
"He's paid to score a goal and when you buy a front man, he is up there to put balls in the net. Unfortunately, at this level, he's found that difficult to do.
"His contribution is all right in build-up terms but in the end it has to result in some form of goals."
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