France playmaker Yoann Gourcuff made his loan with Girondins Bordeaux permanent and signed a four-year deal on Thursday.
"Bordeaux and Yoann Gourcuff are happy to announce that they have signed a four-year deal. Bordeaux have indeed decided to exercise their option to buy the player," Bordeaux said on their website.
The 22-year-old Gourcuff, named Ligue 1 player of the season by his peers on Sunday, had been on loan at Bordeaux from AC Milan since the beginning of the season.
Bordeaux will be crowned French champions for the first time in 10 years on Saturday if they do not lose at Caen.
Gourcuff has scored six goals in the last six Ligue 1 games to help his club sit on a three-point cushion over second-placed Olympique Marseille before the last round of matches.
Bordeaux have already won the French League Cup this season.
French media reported Bordeaux had to pay AC Milan around 15 million euros (13 million pounds) to sign Gourcuff.
"The trust of my coach Laurent Blanc and team mates, the club's ambitions for the next seasons and the support of our fans made me accept this new challenge and my decision is not based on financial grounds, which were not a priority," Gourcuff was quoted as saying by his club.
Gourcuff has earned nine caps for France since making his international debut last August.