Five players have been told their services are no longer required at Palace as Neil Warnock starts to rebuild his squad following play-off disappointment.
The five are Mark Kennedy, Aaron Fray, Ryan Hall, Ben Kudjodji and Moses Swaibu.
Fray and Hall in particular had been expected to break into the first team a couple of seasons ago, but never became more than occasional bench-warmers.
It is expected that more players will be released during the summer.