Southampton are regarded as favourites to land Spezia striker David Okereke.
The young forward is a target for Sassuolo, though they're falling behind Saints in the race for his signature.
Okereke favours a move to England and Southampton are happy to outbid all rivals to convince Spezia to sell.
Saints will offer £15m to sign Okereke, with the offer far outstripping what Serie ASassuolo can put together.
Okereke, 21, moved to Italy from Nigeria.