Head coach Graham Potter believes the £19m Senegal defender, who can play at left-back or left wing-back, is a "really good fit" for the Hammers. John: Very well thought of at Slavia Prague. Potter has a decent record of improving young players so this seems a very sensible signing to me and,

The young, attack-minded Senegalese full-back, signed from Slavia Prague, is expected to add dynamism on the left flank