The German had been exiled at Old Trafford since the Portuguese boss took over in May, but recently returned to training with the rest of the players.
It’s been a tough time for Bastian but he’s been keeping fit with a fitness coach each day at Carrington.
Speaking in his press conference, Mourinho revealed it was a professional decision to bring him back to the team.
“Schweinsteiger is back. We made that decision last Thursday,” he said.
“We phoned him last Friday so he could join the team last Monday.
“It was a decision based on fact that we are in a period of the season where it’s really difficult with everybody together.
“The problem of tactical work that I like to do with 21 players max, to have 23/24 at a time doesn’t happen.
“Looking at Bastian and the way he was working professionally every day with the fitness coach, we think it’s a professional decision to bring him back to the team.
“We will be much better prepared, much better conditions, in case his future decision is to leave the club. In this moment we have no problems in midfield like we do in defence. If we do have problems in midfield, he’s one option for us.
“It’s a decision that can be positive for the group.”
He’s been a complete professional throughout the entire situation and it seems that was the main reason Mourinho reintroduced him.
Bastian has fought his way back into the squad, but he has an uphill task of getting into Mourinho’s stacked midfield.