Full-back Rafael is out for the season with a broken rib.
The Brazilian took a knock before half-time in United's Under-21 game against Leicester this week and he won't make it back in time for the end of the season.
Following the collision, Manchester United manager Louis van Gaal has moved to clarify the defender’s position on the treatment table.
"It's unbelievable," Van Gaal told MUTV. "He has broken his ribs so he shall not play any more this season for Manchester United. It's very unfortunate,” he told MUTV.