West Ham United are losing patience with Marko Arnautovic.
Arnautovic's brother, Danijel, told Sky Sports on Tuesday that West Ham were "using" the player as a "commodity".
The Austrian has been the subject of another rejected bid, believed to worth 19.7m, from an unnamed Chinese Super League club.
West Ham rejected overtures for Arnautovic from China in January.
Now the East London club are weighing whether to cut ties with the 30-year-old striker, who has yet to formally hand in a transfer request.