Antony, Anthony Martial and Scott McTominay were absent from Manchester United training ahead of the mouth-watering Europa League trip to Barcelona.
Erik ten Hag's side take on the LaLiga leaders at the Nou Camp on Thursday evening in the first leg of their knockout play-off.
Antony, Martial and McTominay are set to miss the match through injury having missed training at Carrington on Wednesday morning ahead of flying to Spain.
Lisandro Martinez and on-loan Marcel Sabitzer are suspended for the first leg in Barcelona, but Casemiro is available as his current ban only impacts domestic matches.