Arnautovic is wanted by a Chinese Super League side in a £35m deal that threatens to rock West Ham's season.
The east London club were reported to have received a bid in excess of £35million on Wednesday but were adamant their prize asset would not be allowed to leave this month.
Manuel Pellegrini, the West Ham manager, outlined his determination to keep the Austria forward at the London Stadium but Arnautovic's brother Danijel, who acts as his representative, issued a statement saying that the player wants to leave.
West Ham are exploring the possibility of a move to sign Jonjo Shelvey but are braced to face fierce resistance from Newcastle United. They paid £20 million for him, which is nothing in the current market.
The north London side are now fifth in the Premier League table after having beaten Blackpool 3-0 in the FA Cup third round last weekend. "We know we have a very good player in Marko, a lot of clubs may want him to play for them".
"West Ham bought Marko for peanuts".
The 29-year-old has been a revelation at the London Stadium since he arrived at the club before the start of last season, becoming a talismanic figure in east London after then manager David Moyes made a decision to utilise Arnautovic as a lone striker. He will give 100 per cent for West Ham.
That might well be the players wish, and knowing the big money that sides in China pay it really isn't too much of a surprise that his agent might want him to go too, but the club are going to dig their heels in.
"I don't want to talk about things that might happen".
The Blues are said to be in the hunt for AC Milan striker Gonzalo Higuain and Bournemouth forward Callum Wilson as they look to replace the misfiring Alvaro Morata but former midfielder Steve Sidwell believes Arnautovic could serve as a more cost-effective option for the club.
"I want to keep him, of course, but you never know what might happen in the future". Players of his quality and other players like Declan Rice, Felipe Anderson, other clubs will want them, but that is one thing.
"If it was £50m between Wilson or Arnautovic I would go with Marko", he told The Debate on Sky Sports.
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