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.
West Brom have completed the signing of free agent Nicolas Anelka.
The French striker returns to the Premier League on an initial 12-month contract following an unhappy year in Chinese football and a short spell in Italy.
West Brom will have the option to award Anelka a further year's deal next summer.
Anelka left Chelsea for Shanghai Shenhua in January 2012 but joined Juventus during this year's transfer window.
A move to The Hawthorns reunites him with Steve Clarke, the Albion manager who was still a coach at Chelsea when the striker arrived at the start of 2008.
Anelka, 34, has played for 10 clubs in his career and Albion are his sixth in England.