The Manchester City loanee will miss tonight's Europa League quarterfinal first-leg against Bayer Leverkusen due to injury.
Hammers boss David Moyes explained: He kicked the back of one of the boys' legs and we think he's just tweaked a bit of his lower hamstring at the back of his knee.
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I don't think it's long-term but it only happened yesterday so I'm not quite sure."
Phillips has struggled since joining the Hammers in January.