Cardiff will allow long-serving Kevin McNaughton to leave this summer along with Danny Gabbidon and Nicky Maynard.
Highly-rated Atletico Madrid midfielder Saul Niguez has signed a new five-year contract.
Former Czech Republic striker Milan Baros has returned to Banik Ostrava, the club where he started his career.
The 31-year-old left Galatasaray recently after four years with the Turkish side, following spells at Liverpool, Aston Villa and Lyon.
The Czech club's website revealed the player had signed a deal until the end of next season with an agreement he can join a foreign club for free in June 2013 if there is interest.
Baros spent eight years at Banik between 1993 and 2001 before he moved to Liverpool.