Erik ten Hag has described Antony's injury as "serious" but will need to wait 24 hours before discovering the extent of the complaint.
The Brazil international, 23, was forced out of Manchester United's 4-1 victory against Chelsea at Old Trafford on Thursday night after a robust but fair challenge from Trevoh Chalobah. Antony is now a doubt for the FA Cup final against Manchester City on June 3.
Ten Hag refused to draw any conclusions about Antony's injury but is clearly worried it could be a bad one. The good news for United is that win against Chelsea has confirmed their place in next season's Champions League, with Liverpool missing out.