In January 2019, he was the subject of a £35 million transfer offer from a Chinese club, believed to be Shanghai SIPG, which his agent and brother, Danijel, said Arnautović wanted West Ham to accept. Despite this, on 26 January, Arnautović committed himself to West Ham by signing a contract extension of unspecified length. He also received a 20% increase raising his weekly wage to £120,000. A £40 million release clause was also added to his contract. Arnautović finished the 2018–19 season as West Ham's leading goal scorer, with 11 goals. In July 2019, West Ham rejected an offer of £19.7 million from a Chinese club as Arnautović said he wanted to leave.