New West Ham United midfielder Mateus Fernandes says it is a "big step" for him after completing a move from Southampton. The 21-year-old has joined on a five-year deal for a fee in excess of £40m, making him the Hammers' third-biggest signing, behind Sebastien Haller (£45m) and Lucas Paqueta (£51m).

West Ham United have bolstered their midfield with the signing of Portuguese Under-21 star Mateus Fernandes from Southampton. At the same time, Arsenal have agreed a deal to send defender Jakub Kiwior to Porto on loan with an obligation to buy.

Southampton midfielder Mateus Fernandes is set to undergo a medical ahead of joining West Ham United, according to the Daily Telegraph journalist Mike McGrath. West Ham have been in talks with Southampton all summer over a deal to bring the Portuguese player to the London Stadium.