The Hammers have reportedly spent £3million on the 30-year-old, following the Croatian's mixed spell at Hull.
Jelavic joins the Hammers on a two-year deal, and will be reunited with former Croatian national team boss Slaven Bilic.
BREAKING: West Ham United are delighted to confirm the signing of Croatia striker Nikica Jelavic#WelcomeNikicapic.twitter.com/p6rSZRRLDk
— West Ham United FC (@whufc_official) September 1, 2015
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