West Ham have signed Senegal defender El Hadji Malick Diouf from Slavia Prague for £19m.
The 20-year-old joins the Hammers on a long-term contract and is expected to meet up with the club's pre-season training camp in Germany this week.
Diouf was a key player for Slavia Prague when they won the Czech top-flight title last season.
He said "a lot of clubs" were interested in signing him, but he chose West Ham, as it "was a good plan for me".
"I want to say to the West Ham supporters I'm very happy to be here with them.