West Ham announced the sale of Marko Arnautovic to Chinese champion Shanghai SIPG in a terse, two-line statement on Monday.
The value of the deal was not disclosed in a statement from West Ham which offered no thanks for the Austria forward's 22 goals in two seasons.
The club's Twitter account message was even shorter: "Marko Arnautovic departs ."
British media reported the transfer fee was around 22 million pounds ($27.6 million).
Relations between West Ham and Arnautovic have been tense since he sought a move to China in January, and got worse this offseason.
Arnautovic leaves despite signing a contract extension in late January.
The 30-year-old forward was a club record 20 million pounds ($25 million) signing from Stoke in 2017.
At Shanghai, Arnautovic will join up in attack with former Brazil internationals Hulk and Oscar.
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