The 33-year-old, who spent the 2016-17 season in Italy with Torino, is realistic about what is to come but believes he still has plenty to offer.
"I'm totally open. I just want to play at the highest level I can," Hart told The Guardian.
"In England, I don't feel I am going to be able to do that. Maybe if I hadn't achieved what I've done in this league I might not be so ready to step away.
"Don't get me wrong. I'd love to have another big chance in England, but it could be difficult."