"I had a feeling when I left Dortmund that it would not be a door that was shut forever," Kagawa said.
"I had a real ambition to play in England - but now I feel I am back where I belong.
"Being back with Dortmund feels like being back with family - and as a player there is no better feeling than that.
"I don't feel like I have anything to prove to the fans in England - but I know that in England they did not see the best of me.
"Already I am feeling that I am on the way back to the level I want to be.
"It will take time - but I am finally on the right path."
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