West Ham striker Marko Arnautovic has been ruled out for a month with the hamstring injury he suffered in Tuesday's 3-1 win over Cardiff.
The Austria international will miss the Christmas period, although he could be available for the FA Cup third round tie against Birmingham in January.
The 29-year-old has scored five goals in 13 league appearances this season.
"Arnautovic has a muscle injury," said West Ham boss Manuel Pellegrini. "He'll probably be out for around one month."
West Ham take on Crystal Palace at the London Stadium on Saturday.
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