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.
All the latest transfer news, with Aston Villa reportedly set to finalise a deal for Dimitar Berbatov.
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.
West Ham and Southampton's Europa League third round qualifying matches provided plenty of entertainment on Thursday night.
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Bojan made his return for Stoke City in their 2-0 defeat to Brentford, while a host of Premier League sides drew their pre-season friendlies on Saturday.
Diego Poyet has warned West Ham they must improve to stand any chance of extending their run in the Europa League.
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Ten-man West Ham avoided an embarrassing Europa League exit to FC Birkirkara with a 5-3 penalty shoot-out victory.
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Slaven Bilic believes West Ham's penalty shoot-out composure in Malta bodes well for their next Europa League qualifier.
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West Ham boss Slaven Bilic says his side are still clear favourites despite taking just a one-goal lead to Birkirkara.
West Ham have signed Argentinian midfielder Manuel Lanzini, club co-chairman David Gold has announced.