Sassuolo have announced the signing of attacking midfielder Jeremie Boga from Chelsea, who retain a buyback clause.
The deal was confirmed by both clubs, with Sassuolo adding Chelsea had a repurchase option, although its details were not disclosed.
The Neroverdi have paid a reported €4m for the 21-year-old, who represented France at youth level but has since pledged his international allegiance to Ivory Coast.
He won two FA Youth Cups, the UEFA Youth League and an Under-21 Premier League with the Blues and spent time on loan at Rennes, Granada and Birmingham City.
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