AC Milan on Tuesday completed the full signing of Ghana midfielder Kevin-Prince Boateng from Genoa.
The 24-year-old spent the last season with Milan but was part owned by Genoa, who bought him from Portsmouth a year ago.
The two Italian clubs then entered a part-ownership agreement and following three hours of talks on Tuesday, Genoa president Enrico Preziosi announced that a deal had been struck for Milan to buy out the second half of Boateng's contract.
"Two clubs like Genoa and Milan cannot argue so we've come to an agreement and Boateng is entirely a Milan player," said Preziosi.
As part of the deal part-owned players Alberto Paloschi, Marco Amelia, Nnamdi Oduamadi and Gianmarco Zigoni have transferred to Milan while Greek centre-back Sokratis Papastathopoulos has returned to Genoa.
The only player still owned by both parties is young striker Giacomo Beretta, who will play with Genoa next season.
Preziosi didn't divulge any details of payment between the clubs.
Last week both Milan and Genoa had accused the other of trying to move the goalposts on an agreement struck a year ago.
Preziosi claimed there was only a 50 percent chance that a deal would be done but now the complicated transfer saga has come to a conclusion.