The former Chelsea, Manchester United and AS Roma midfielder is returning to Serie A after two years away.
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Matic, after a superb 12 months with Roma, was sold to Rennes, where he spent six months before he left for Olympique Lyon.
Now, after 18 months with OL, he is returning to Italy to join Sassuolo.
The Serie A minnows have announced Matic, 37, has agreed a 12-month deal with an option for another year if certain conditions are met.
As Sassuolo have recognised, Matic is the most decorated player to ever join the club