Manchester United will be without Antony for their Europa League last-16 second leg against Real Betis.
The 23-year-old forward missed training on Wednesday through illness and has not travelled with the 21-man squad.
United boss Erik ten Hag said Casemiro and Bruno Fernandes will play despite each being one card away from a ban.
“We had a good result, but we have to go again and we need our best players,” said manager Erik Ten Hag, who saw his side win the first leg 4-1 at Old Trafford.