Jeremie Boga has attracted interest from Atalanta and Napoli, among other European clubs, but the winger's agent is unclear if Chelsea will activate a buy-back clause.
The 23-year-old has impressed in Serie A since joining Sassuolo for £3.5million, including scoring eight goals in the currently suspended 2019-20 campaign.
He had scored four goals in his last six games ahead of the stoppage in play due to the coronavirus outbreak which included scoring a decisive fourth goal in Sassuolo's 4-2 win at home to Roma.
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Boga moved to Italy in 2018 after making just one first-team appearance during his time at Chelsea, having spent time out on loan at Rennes, Granada and Birmingham City.