West Ham have signed FC Sion midfielder Edmilson Fernandes.
The 20-year-old was introduced on the pitch of the London Stadium prior to Thursday evening's Europa League qualifier against Romanians Astra Giurgiu.
Fernandes, the cousin of former Manchester City and Leicester midfielder Gelson Fernandes, becomes manager Slaven Bilic's ninth signing of the summer.
He has put pen to paper on a four-year contract with the Hammers.