Sassuolo have confirmed West Ham United and PSG have both submitted a £33.8million offer for Gianluca Scamacca.
The 23-year-old scored 16 times in 36 Serie A appearances last season.
Saussolo chief executive Giovanni Carnevali said: "West Ham are offering €40m for Scamacca and PSG offering €35m (£29.6m).
"There are also some add-ons as difference. There's no agreement with any club now.
"Nothing is certain. Yes, there are also some bonuses that are different, but there are issues that are not strictly financial, they are tied to the technical project and what the player wants.
"What we can say for certain is that we are not a club who are forced to sell, so we need to listen to the needs of the player, to the offers that come in and that could come in from one day to the next."