Alaba upset many Bayern Munich supporters with the gesture.
But he told BILD: "It doesn't mean that I no longer love Bayern. It was just a very special day for me.
"It was the beginning of a new stage, but I didn't want to provoke the Bayern fans at all, where I spent thirteen wonderful years. I will always be grateful to the fans and the club for giving me the opportunity to develop as a person and a player. Munich became my second case. I did not want to hurt sensibilities."
Alaba added: "The work with him is fantastic. In Munich we already had a very good relationship and the enthusiasm he transmits in each training session has not changed."
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