Galliani believes Ibrahimovic is right to do so, having went back on a promise made to the player.
"Ibrahimovic wanted to stay at Milan," Galliani told France Football.
"At the end of last season he came to me with his agent Mino Raiola and I assured him that he would stay. But the board had some discussions and he was sold.
"Since he went to Paris he doesn't speak to me anymore. He is right though as I didn't keep my word."