The England Under-21s international has been linked with a move away this summer after a bright start to 2013-14, though he was loaned out to QPR in February after fading from the first team.
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"He's contracted to West Ham," the manager told reporters.
"I think he's had a hernia op. Once that's healed up I hope he becomes a better player because he has been playing with it for a while. The groins have been causing him a problem for a while.
"If you've got pain, I don't think you perform to your best. Hopefully that pain will have ended and he'll be a much freer, more active player for us. If he could do what he did last season, that would be great because, when he broke in to the side early last year, he had a great spell. Unfortunately he couldn't sustain it.
"If he continues to do what he did last season then yes [we want to keep him] but that does depend on how much players want, how much they demand. If that demand is far too great then that becomes a difficulty for us."