Reid ruled out for the season
West Ham defender Winston Reid is expected to miss the rest of the season with a knee injury.
The absence of the 29-year-old New Zealander would be a major blow to the Hammers' bid to stay in the Premier League.
Right-back Sam Byram could also miss the rest of the campaign with an ankle problem.
David Moyes' side are 14th, three points above the relegation zone, with nine games remaining.
Reid played for the first time in almost two months at the Liberty Stadium last Saturday, but was replaced by Byram after 27 minutes.
The Hammers have lost successive games 4-1, to Liverpool and Swansea, and play at home to Burnley on Saturday. Angelo Ogbonna, however, is set to return following illness and James Collins could be back from a hamstring strain.