"He is a player we are interested in," said Peter Coates, "and our manager, Tony Pulis, is involved in progressing that.
"I know Tony feels he's a good player who can play at this level."
Leldey is thought to have been in talks over the past couple of days with Stoke as they try to thrash out a deal.
Ledley is officially a free agent with his Cardiff contract running out yesterday.