The Japanese midfielder, 31, had his deal ripped up by mutual consent a SEASON before it was due to end.
"The club wishes to express thanks for the professionalism shown by the player during the time that he has worn the Zaragoza shirt, while wishing him future professional success."
In an online press conference, Kagawa expressed his regret at the situation.
He said: "To be honest, it's not what I wanted. I really regret having to leave unexpectedly."