Kevin-Prince Boateng has left AC Milan and is set to sign for Bundesliga club Schalke 04. The Ghanaian midfielder was in Gelsenkirchen and undergoing a medical examination, paving the way for his return to the Bundesliga, where he previously played for Borussia Dortmund. Boateng played his last match for AC Milan on Tuesday in the second leg of the Champions League play-offs, where he scored two goals.