West Ham United star Michail Antonio has given his side an injury scare this week.
David Moyes' side are concerned about Antonio ahead of Thursday's crucial European clash with AZ Alkmaar.
The Hammers take on the Dutch side in the second leg of their Europa Conference League semi final, as they look to defend a 2-1 lead from the home leg.
The schedule's been relentless and I've started to see a bit of fatigue in games," Moyes said to reporters.
We played Manchester United last Sunday, Alkmaar on Thursday.
[Antonio's] got a bit of a calf injury so I couldn't really tell you much more at the moment."