Manchester United boss Erik ten Hag admits concerns over Marcus Rashford's injury after victory over Everton.
Rashford looked to have pulled his groin in the 78th minute.
He looked in discomfort as he received treatment on the sideline before being replaced by Wout Weghorst two minutes later.
Ten Hag said, "We have to wait, it doesn't look well.
"Once again that is due to the schedule. It can't be that you play three games in six days.
"We have to protect our players. Everyone wants the best players on the pitch. Everyone wants to see great, entertaining football like today. But then you need your best players."