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Blues director Marina Granovskaia recently turneda €15m (£13.5m/$18m) buy-back clause on Boga into a shrewd sell-on clause that will see Chelsea claim 10-15 per cent of any agreed fee.
Sassuolo have set an asking priceof€30 million for Boga with Serie A trio Atalanta, Napoli and Roma all circling for the 23-year-old, who has impressed over the past two seasons in Italy's top-flight.
The former Blues youth product scored 11 league goals across the 2019-20 campaign as he justified his decision to leave Stamford Bridge permanently in 2018.
A Premier League returncould also still be on the cards for the midfielder with Brighton also believed to have shown some interest in securing his services.
Boga himself is eager to leave Sassuolo this summer and challenge himself elsewhere after a strong two seasons.As it stands, Rennes are looming as his most likely destination with their recent bid likely to makeSassuolo consider sanctioning a transfer.
Rennesmanager Julien Stephan recently spoke out about his admiration for Boga as the Ligue 1 side look to secure a deal.
“I can’t speak about numbers. He is quite simply a player who is coming out of a very good spell with Sassuolo,” Stephan toldTelefoot.
“He has very interesting characteristics in terms of his penetration, his pace and his ability to finish off moves. We know him well at the club as he was on loan here a few seasons ago. At the time, I was in charge of the reserves, we got to know each other in certain instances, we know each other.
“He is a player who is one of our potential targets, there is enormous competition with very big clubs – we will see what happens in the coming weeks and months."