The Frenchman will sign a two-year deal worth approximately £3.6m a year.
Can Ribery continue his trophy haul?
Ribery will link up with another Boateng, Jerome Boateng's brother Kevin-Price Boateng, who left Barcelona on loan to join the Viola.
“He is here welcome mon fere,” KP Boateng shared on his official Instagram page.
The two players will add offensive power to a side that finished 16th in the Serie A last year, narrowly escaping relegation.
American business owner Rocco Commisso bought the team last year for $181 million with hopes he can revive the decorated club.
Fiorentina has not won the league in 50 years.
— ACF Fiorentina (@acffiorentina) August 21, 2019