"Unfortunately (the injury) is a little bit slower than we expected and hoped for," Bilic told reporters.
"Regarding the game against Watford, he'll try to run today (Thursday) and if he's good then maybe he has a chance to be in the squad for Saturday. I don't want to rule him out for Watford.
"This is not a big injury but he needs to play, he needs to be available and hopefully he will train tomorrow."
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West Ham are 10th in the table with 32 points, two ahead of 13th placed Watford with 13 games remaining.
(Reporting by Shravanth Vijayakumar in Bengaluru)
