Schalke have confirmed the signing of midfielder Kevin-Prince Boateng from AC Milan on a four-year deal.
Bundesliga side Schalke have recently been linked with several players, including Lukas Podolski, Ronaldinho, Samuel Eto'o, Fabio Quagliarella, and Emmanuel Adebayor.
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Boateng, however, had not been mentioned in relation to a move until Sport Bild reported on his medical ahead of Schalke's confirmation.
Berlin-born Boateng returns to Germany four years after his loan spell at Borussia Dortmund in 2009, and speculation suggests that his exit could pave the way for Real Madrid's Kaka to return to the San Siro.
The half-brother of Bayern Munich's Jerome Boateng, he has spent the last three seasons in Italy and on Tuesday helped Milan secure their place in the Champions League group stage as he scored twice against PSV Eindhoven.
Boateng, who had one year left on his contract at AC Milan, has signed a four-year deal at the Veltins-Arena and has moved for a fee believed to be around €15 million.
"He is exactly the reinforcement we needed and had wished for," Schalke CEO Clemens Tonnies said.
Despite playing for Milan in the Champions League already this season, Boateng is available for selection for Schalke during the group stage, according to UEFA'S 18.07 rule.
Boateng said on Friday evening: "The Bundesliga is the best league in the world and the best players also belong there. I'm delighted to be back home.
"I'm absolutely delighted that I can play for a top club like Schalke. This is a new challenge for me."
"We're really delighted to have been able to sign him because we've been working intensively on this for weeks," said Schalke's director of sport Horst Heldt. "It was easy to convince Kevin to join us, but it was harder to convince Milan to sell.
"Kevin's done really well there and was a fans' favourite. He has great leadership qualities and we hope we will have a successful future with him."