The midfielder was substituted in the 40th minute during the defeat against Chelsea at the weekend and is considering his future at Upton Park.
"He was subbed before half-time because I needed to change the game tactically, had to change the game somehow and for me it was about changing two players, who weren't playing any worse than the rest - or any better - but I had to change it tactically," Allardyce said.
'He played brilliantly in the first game, scored a good goal, came on as a sub at Newcastle, played a bit of the game in the Capital One Cup, was due to play in the next game but pulled a hamstring and unfortunately we don't see him for six weeks. And that's Joe's problem, too many niggling injuries. You wait, and keep waiting, for him to come back.
"And then he comes back and then instead of having a run to get back to his top form, the little niggle knocks him back again. And he tries to get back to it. Ultimately, the only way to get back to top form is playing on a consistent basis and that's a struggle for Joe to do. We have had him at top form, but obviously not for long enough. And that's a shame. He loves playing and he loves West Ham."
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