The 39-year-old joined United in a £6.5million transfer from Bayern Munich in 2015 and spent two years at Old Trafford.
Schweinsteiger made 31 appearances during his first season with the Red Devils and subsequently earned a spot in Germany’s Euro 2016 squad.
But upon his return to Manchester for pre-season after the tournament he quickly found himself out of favour.
Speaking to Gary Neville for Sky Bet’s The Overlap, Schweinsteiger revealed Mourinho – who had just been appointed as manager – stopped him from entering the dressing room.
The former Germany captain said: “It was 2016 and I was with the German national team, we went far in the competition [Euro’s] reaching the semi-finals, so I stepped in a little later [at Man Utd] and the team were in the US for a pre-season tour.