Antony has been carried off on a stretcher during the first-half of Manchester United's penultimate home match of the season against Chelsea on Thursday evening.
The Brazilian went down in a heap just before the half-hour mark after successfully navigating his way through a crowded Chelsea defence before being clattered in a challenge by Blues defender Trevor Chalobah.
Antony hit the Old Trafford turf, momentarily rising to demand a foul before curling up and rolling around in agony as play carried on.
No free-kick was given as Chalobah appeared to win the ball cleanly and Antony at first glance looking like he was playing for the foul that never came.