Tredwell played in the Twenty20 series against New Zealand last winter but did not feature in the one-day internationals.
Giles, however, said that Tredwell's attitude makes sure that he is always in the thoughts of the selectors.
"James is a very mature bloke, just dead straight, and is a good bloke to have around," Giles told ThisisKent.co.uk.
"I really enjoy his company and he is a very honest and down-to-earth bloke and they are great traits to have for a captain and coach and as a captain.
"He is the sort of bloke you would run through a brick wall for so I think he will have some good success as captain for Kent and be in the mix for England."
Tredwell has played 14 ODIs for England.