Kouyaté, the Senegal midfielder, passed his medical on Wednesday after agreeing personal terms on a four-year contract and moves across London for a fee of £9.5m plus £1.5m in add-ons. The 28-year-old spent four seasons in east London after joining from Anderlecht in 2014 and will provide competition in midfield after the departure of Yohan Cabaye and the Chelsea loanee Ruben Loftus-Cheek.