Xande Silva is expected to undergo a West Ham medical today as he prepares to complete a move from Vitória Guimarães.
According to O Jogo, Silva has said his goodbyes at the Portuguese club as he prepares to move to London.
Silva, who can play as a striker or out wide, is set to sign a West Ham contract until 2021.
The Hammers are believed to be paying a fee in the region of €1.5 million for the young striker.
Vitória Guimarães have inserted a 10% sell-on fee from any future sale involving Silva. The report also mentions a €15 million release clause.
Silva is a Portuguese youth international and has impressed coming through the ranks at Guimarães.
West Ham have been searching for another striker this summer, but it is yet to be seen what role Silva will play within the first-team squad going forward.
