Manchester United boss Erik ten Hag has updated the media on midfielder Scott McTominay's injury.
The all-action Scotsman was not able to finish their 1-1 draw against Burnley in the Premier League.
McTominay, who has netted vital goals from midfield, faces a race against time to make the FA Cup final.
Speaking with club media, Ten Hag said: "We have to assess this, to set the diagnosis.
"I don't know in this moment to return [against Crystal Palace next month], I think it's a little bit too quick turnaround."
"I don't know," he added to TV interviewers.
"You have seen he has a problem. We have to diagnose this and see what it is."