West Ham have described the injury suffered by Enner Valencia in the Europa League on Thursday as being "significant."
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Slaven Bilic admits West Ham must improve on their discipline to stand any chance of progressing in the Europa League.
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West Ham were held 2-2 at home by FC Astra in the Europa League after letting a two-goal lead slip and being reduced to 10 men.
Enner Valencia will have a scan on his knee on Friday after being hurt during West Ham's latest Europa League qualifier.
West Ham boss Slaven Bilic has not given up signing Barcelona midfielder Alex Song on a permanent deal.
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