The Republic of Ireland international is currently on a season-long loan at the Britannia Stadium from Villa, where his contract expires in the summer.

Potters boss Mark Hughes said: "We're trying to do something with Stephen if we can. I know we've had discussions with his people and I've spoken to Stephen myself.

"I think there's a willingness on both sides to get something done. Nothing's been agreed formally yet but I think the intention is there to try to do something if we can."