Hart will make his Irons debut at Manchester United on Sunday.
“I'm trying to make a point to Slaven Bilic – he's my coach," said Hart. “And to make my point to Gareth Southgate, the England boss. They are the people whose opinions I really care about.
“City? I don't think about that. I am a West Ham player now – that's all I think about.
"The other side of it is quite political – with contracts – and I respect that. And I respect my parent club, but all I care about right now is West Ham."
Did he feel Guardiola had given him a fair chance?
Hart replied: “That is gone. I am not part of that club at the moment."