Nsereko has signed a four-and-a-half year deal with the Hammers and will be a direct replacement for the departed Craig Bellamy.
CEO Scott Duxbury commented on the capture to the official site, "We are delighted to sign Savio, particularly with the fierce competition for his services across
"He is an exciting prospect, who Gianfranco Zola believes will prove a valuable asset for this club now and in the years to come. It is a significant investment and shows our determination to continue moving this club forward."