Arsenal will have to wait for further scans on David Luiz to learn the extent of his injury, which he picked against Sheffield United on Sunday evening.
The defender returned from his two-match suspension to play a key role as the Gunners booked a place in the last four of the FA Cup competition courtesy of a 2-1 win over Sheffield United.
The defender though did not finish the game after he was forced off in the second half with what seemed like a minor injury knee injury.
Speaking after the match though, coach Mikel Arteta gave further insight into the defender's struggles, noting they will wait for further reports on Monday.
"It was his ankle," explained Mikel Arteta in his post-match press conference.
"He will get assessed [on Monday] but he was in pain."
Meanwhile, the Spaniard was impressed by his side's general performance on the evening, giving them their second win in four matches since the restart.
"We have to bear in mind that we played four away games, I think we're the only team that has done that. With Manchester City and all the things that happened over there, then the way we threw the game away at Brighton, it was a very different game,"
"I am very pleased today, I never fault the effort of the players. I am really happy about how the front players are going about the defensive job, we still have big gaps to improve in many areas but I am really happy today,"
The team will now shift their attention to Wednesday night's Premier League clash against Norwich City at the Emirates Stadium.