Gianluca Scamacca flew in to London last night ahead of completing his medical at West Ham today.
The Italy striker will join for £30.5m with a further £5m in add-ons and has been offered a five-year deal with the option of an extra year.
Talks are also ongoing with Eintracht Frankfurt winger Filip Kostic who shares the same agent as Scamacca.
The 23-year-old netted 16 goals in 36 appearances for Sassuolo in Serie A last season and his form has been rewarded with seven caps for Italy since his debut in September.