Brazilian Lucas Paqueta suffered a fresh ankle injury during West Ham training.
The severity is unclear, but Standard Sport reported that he looked devastated as he withdrew early from a session at Rush Green on Tuesday.
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He will now be assessed by the club’s medical staff.
The Brazilian had been regaining form under Graham Potter, making another sidelined spell a major blow for the manager.
Paqueta played a key role this season, recently returning from a minor knock to complete the full 90 minutes in Saturday’s 1-0 home defeat to Brentford.
If the injury proves serious, Carlos Soler is expected to deputize, as he has done earlier this season.