Alessandro Matri has completed a permanent move to Sassuolo.
Matri, who turns 32 later this week, underwent his medical on Tuesday and will move to the Europa League hopefuls one year from the end of his contract with AC Milan.
Milan, via a statement, sent their well wishes to the journeyman striker.
"Even though these recent years you have played with different teams, you have always represented the values of the AC Milan family," the statement said.
"Today we say goodbye to you, Alessandro, a great guy and an exemplary professional."
After signing for Milan in 2013, Matri enjoyed loan spells at Fiorentina, Genoa, Juventus and lastly with Lazio.
Following the sales of Nicola Sansone and Sime Vrsaljko, Sassuolo have remained conservative in their transfer strategy as they attempt to replicate last term's sixth placed finish.
They open their Serie A campaign away to Palermo on Sunday.
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