Boateng

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Moenchengladbach's Alvaro Dominguez of Spain, top, and Schalke's Kevin-Prince Boateng of Ghana challenge for the ball during the German Bundesliga soccer match between FC Schalke 04 and Borussia Moenchengladbach in Gelsenkirchen, Germany, Sunday, April 27, 2014. (AP Photo/Martin Meissner)

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Schalke's Kevin-Prince Boateng of Ghana stretches during the last training session prior to the UEFA Champions League first leg knock out soccer match between FC Schalke 04 and Real Madrid in Gelsenkirchen, Germany, Tuesday, Feb. 25, 2014. (AP Photo/Martin Meissner)

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Mainz's Nikolce Noveski, left, and Schalke's Kevin-Prince Boateng, right, challenge for the ball during the German Bundesliga soccer match between FC Schalke 04 and FSV Mainz 05 in Gelsenkirchen, Germany, Friday, Feb. 21, 2014. (AP Photo/Martin Meissner)

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Schalke's Kevin-Prince Boateng of Ghana, left, and Mainz's Johannes Geis challenge for the ball during the German Bundesliga soccer match between FC Schalke 04 and FSV Mainz 05 in Gelsenkirchen, Germany, Friday, Feb. 21, 2014. (AP Photo/Martin Meissner)

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Schalke's Kevin-Prince Boateng of Ghana, left, and Mainz's Johannes Geis challenge for the ball during the German Bundesliga soccer match between FC Schalke 04 and FSV Mainz 05 in Gelsenkirchen, Germany, Friday, Feb. 21, 2014. (AP Photo/Martin Meissner)