West Ham defender Issa Diop has suffered an ankle injury that could keep him out for the rest of the season.
Diop could miss the next eight weeks with ligament damage suffered in the Hammers' 1-1 draw with Burnley on Sunday, says The Guardian.
Moyes, who is hoping to steer West Ham to their first victory in a European semi-final since 1976, could be forced to deploy Declan Rice at the heart of his defence against Bundesliga outfit Frankfurt.
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