West Ham hope to wrap up the £19.2m signing of Luis Guilherme from Palmeiras following his medical on Tuesday.
The 18-year-old Brazilian winger is expected to sign a five-year contract with the Hammers.
He has agreed to join with the transfer fee including £5m in add ons and a 20 per cent sell on for Palmeiras.
A pacey winger that can also operate as a second striker, Guilherme made his senior debut for the Brazilian side in April 2023, and went on to make a total of 19 appearances in the Brasileirao Serie A last season.
18-year-old Palmeiras winger has agreed a £19.2million deal to join West Ham this summer
Guilherme was also part of the Brazil U17 side that secured victory in the Montaigu Tournament in 2022.
In France Guilherme netted three times in four games, including two against an England side featuring Arsenal starlet Ethan Nwaneri.
Since then Guilherme has also made his Brazil debut at U20 level, starring alongside Barcelona striker Vitor Roque.
West Ham keeper Nathan Trott is discussing a £1m move to FC Copenhagen.