Midfielder Shinji Kagawa has rejoined Borussia Dortmund from Manchester United for an undisclosed fee.
The 25-year-old has signed a four-year deal with the German club, for whom he played from 2010 to 2012, prior to his move to Old Trafford for £12m.
Meanwhile, the Red Devils are in talks with Real Madrid over a potential loan exit for Javier Hernandez.
Mexico international Hernandez, 26, joined United from Guadalajara in 2010 and won two Premier League titles.
Japan's Kagawa scored six goals in 57 appearances for United during a two-year spell in which he found it difficult to secure a regular starting spot in the first XI.
"I wanted to realise my Premier League dream but now I'm happy to be back in Dortmund in this great team. Dortmund is like a family," the midfielder said.
|Shinji Kagawa at Manchester United|
He made just one one appearance under new United manager Louis van Gaal this season - in their 4-0 Capital One Cup defeat against MK Dons.
"I said on the day of my departure that my story with Borussia Dortmund was not completed," Kagawa told Dortmund's official website.
Kagawa joined Dortmund from Cerezo Osaka and went on to make 61 appearances for the Bundesliga club, scoring 24 goals.
His departure comes as United this week completed the British-record £59.7m signing of midfielder Angel di Maria from Real Madrid.
They are also close to the £13.8m signing of versatile Netherlands international Daley Blind from Ajax.