Langley has been told by City he can leave with Dave Jones naming him as a player he's looking to get rid of.
Palace boss Iain Dowie said
"I know Richard from my days at QPR and we'll see if he likes us and we like him. He has done well, but he has only been here for two days.
"He has had a few problems at Cardiff and I thought it would be good to take him out of that environment and see if we can give him a chance here."