West Ham striker Andriy Yarmolenko broke down during their FA Cup defeat at Manchester United last night.
Hammers boss David Moyes admits the Ukraine international has suffered a knee injury.
“Andriy seems to have injured his knee ligaments. He will need additional examination.
"I hope that the damage is not serious," said Moyes.
This season, Yarmolenko has played 21 matches for West Ham, with 3 goals and 4 assists on his account.
