Manchester United star Antony is likely to miss his side's FA Cup final date with Manchester City.
The Brazilian came off on a stretcher as they beat Chelsea 4-1 at Old Trafford in the Premier League on Thursday.
Antony was injured during a first half incident after a fair challenge from Blues defender Trevoh Chalobah.
Post-game, boss Erik Ten Hag told Sky Sports: "It's difficult to say. Let's wait for 24 hours and then we'll know more."
On the game itself and Champions League qualification, he added: "This club belongs in the Champions League. It's not easy in the Premier League so a lot compete for that. It's massive when you get it done. We wanted to win. We showed the winning attitude.
"Chelsea have outstanding players but in the counter attacks we were really good, really dangerous. We scored four in the end. We should've scored more but they could score as well. Our defence was better second half. First half we had problems between the lines.
"They played without pressure, could go forward. You have to strike them and take advantage of the spaces you get and we didn't always. Second goal was late in the first half and could've been earlier. Still we can be third in the league. It's important to keep focus, not getting injuries as well. But also get a home record. It's going to be an important game, we want to win that game."