Skysports.com understands Miguel Llera is set to leave Charlton when his contract expires at the end of the season.
The Spanish defender is out of contract in the summer and he will not be signing a new deal at the Valley.
Llera joined Charlton on a free transfer in the summer of 2009 after leaving MK Dons.
After a successful first season at Charlton, Llera has struggled to hold down a regular place in the side this term, making just 17 appearances.
News of the central defender's availability on a free transfer this summer is sure to alert a number of clubs in England and abroad.