"But in this affair I totally trust my brother".
The forward has admitted while on worldwide duty with Austria that he wants to be competing with the best players.
According to the agent of Marko Arnautovic, Everton are interested in the Austrian attacker.
Arnautovic, who moved to east London in the summer of 2017 from Stoke for a then club record fee worth up to £25m, has been in outstanding form since being handed a more central role by former manager David Moyes last season, and scored 11 Premier League goals last term.
Manchester United were linked with a move for Arnautovic in the summer but West Ham were unwilling to sell a player they consider to be a crucial member of the team.
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A permanent transfer may have to wait until the end of the season as the newspaper says an initial loan deal if more likely this winter with the Express claiming that Manchester United and West Ham are among the clubs showing a keen interest in offering Cahill a fresh start.
"You've got to try and keep him if you want to try and compete or get closer to the top six, you've got to keep players like Marko Arnautovic".
He leads the team in scoring again this season under new boss Manuel Pellegrini with five goals in 10 appearances, and believes the time is right to challenge himself at a higher level.
Arnautovic's agent, his brother Daniel, says the Austria global is considering a January exit and claims a host of top sides in England are monitoring his situation. But there is still that feeling, that this can not be the end.
Highlights from West Ham's win over Burnley in the Premier League.
But the pundit has warned Arnautovic he may not be guaranteed the Champions League football he craves if he joins the Red Devils.