West Ham have rejected a £19.7m bid for Marko Arnautovic from a Chinese Super League club, Sky Sports understands.
It is understood the Hammers regard the bid as 'insulting'.
Sky Sports News was told earlier on Tuesday Arnautovic had handed in a transfer request. However, sources at the club say they have not received a formal transfer request.
The 30-year-old has told the club he is determined to leave east London during this summer's transfer window.
West Ham's position on Arnautovic has not changed - he is not for sale and the Hammers expect him to honour the contract extension he signed in January.
The Austria forward attracted interest from two Chinese clubs, believed to be Shanghai SIPG and Guangzhou Evergrande, in January, with West Ham rejecting a £35m bid for him.
His brother Danijel, has now criticised the Hammers for treating his brother like "a commodity".
"He's not a cow or a horse which you bring to market," Arnautovic's brother exclusively told Sky Sports News. "He's a highly talented footballer who is simply being used by West Ham. He's just a number to them.
"West Ham were trying to get rid of Marko right up until the last minute of the January transfer window and they are still trying to sell him right now. To them he's just a commodity.
"West Ham are still speaking to the Chinese club. He is still for sale and it's simply a case of how much money West Ham can get for him."
Rather than cash in on Arnautovic in January, Manuel Pellegrini agreed to give him a new £100,000-a-week deal, keeping him at the club until 2023.
Arnautovic joined West Ham from Stoke two years ago for £25m and has scored 22 goals in 65 appearances.
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