For all of the Red Devil fans that wanted to know why, the Portugal international finally provided an answer in an interview with The Daily Mail.
[Bayern] really put in a lot of effort and I immediately got a feeling the people in charge believed in me as a player. That was the decisive factor behind my decision to join.
Ancelotti always looks calm and in charge. You can just see he has a lot of experience. He is getting involved with his players a lot and is helping players to make individual progress.
But I am also playing alongside a lot of world-class players here. I can learn from all of them, especially from the players who play in midfield like Arturo Vidal, Xabi Alonso and Thiago Alcantara.
Renato Sanches’s has gotten the chance to play “alongside a lot of world-class players”, but those chances have come few and far between this season. He has made just eight starts this season after making 32 with Benfica last season.
But Bayern Munich do have a great opportunity to win two titles this season (three if they can turn around a 2-1 aggregate deficit against Real Madrid in the Champions League). That’s many more than Manchester United are competing for right now.