Italian champions AC Milan announced on Tuesday the permanent signing of Ghanaian attacking midfielder Kevin-Prince Boateng after buying out his contract from Genoa. "Two clubs like Genoa and Milan cannot argue so we've come to an agreement and Boateng is entirely a Milan player," Genoa president Enrico Preziosi was quoted as saying on Skysports.com. The 24-year-old has been co-owned by Genoa and AC Milan since leaving English Premier League side Portsmouth in the summer of 2010. He has been a key figure in Rossoneri's successful campaign that saw them win their first Serie A title since 2004. Boateng, who also played a key role in helping Ghana reach the 2010 World Cup quarter-finals, repeatedly revealed his desire to remain at San Siro after settling in quickly.