The 25-year-old winger made his league debut for Roma aged just 16 before moving to the Stadio Artemio Franchi in 2010.
A statement on the club's website read: "Torino are happy to announce the acquisition of Alessio Cerci in a co-ownership arrangement with Fiorentina."
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Cerci racked up 12 goals in 46 appearances over the course of two seasons with the Viola.
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