Mourinho said: “I thought after I read some quotes from people at Bayern Munich that they would run to Manchester to bring him back, but no, it did not happen. I am quite surprised that Mr Rummennigge is not here.”
The United manager, who takes his team to Hull in the Premier League tomorrow, has revealed that midfielder Andreas Pereira will be joining La Liga club Granada on loan.
Meanwhile, the United boss has welcomed a Europa League group stage draw that will pit his team against Feyenoord, Fenerbahce and Ukrainian side Zorya Luhansk.
He said: “It’s good for us because it feels as if we are in the Champions League.
“There are groups of a similar quality in the Champions League. We know it will be a difficult group.
“I think it’s good for the competition, which doesn’t have the same glamour in the Champions League. To have Manchester United in the competition playing against clubs such as Fenerbahce and Feyenoord is good for us.”