Included in it is Diogo Dalot, Leny Yoro and Joshua Zirkzee, who all took part in Tuesday morning's training session at Carrington following their respective recent absences.
Matthijs de Ligt was spotted going through an individual workout on another pitch and is one of only two first-team players to miss out through injury, with long-term absentee Lisandro Martinez being the other.
Young forward Chido Obi is ineligible for the Europa League.
Amorim is expected to speak about his squad and provide an update on the availability of his players for Wednesday's 20:00 BST kick-off during a pre-match press conference this (Tuesday) evening.
He's set to be joined by Bruno Fernandes and Harry Maguire at the media briefing and we'll bring it to you on MUTV, ManUtd.com and the United App from 18:00 BST as part of a special 75-minute show.
Subscribe now to make sure you don't miss it.