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David Moyes' decision to sign Juan Mata spelt the end for Shinji Kagawa's Manchester United career, according to Sir Alex Ferguson.

Ferguson said the Japanese midfielder 'settled in well' during their one season together at Old Trafford before the Scot retired as United boss.

But he insists Mata's arrival for a club record fee last season was the beginning of the end for Kagawa, who returned to Borussia Dortmund in the summer.

Ferguson told German newspaper Bild: "Shinji is back in the environment in which he feels right. And he has with Klopp a coach who gives him the necessary self-confidence.

"I was very pleased with Shinji. He had settled in well with me, and I also had the feeling that he felt comfortable with us.

"Every coach has his own philosophy. As Moyes preferred Mata, Kagawa has felt that he is no longer first choice and was a bit resigned."