The midfielder struggled in the second-half of the season with Leeds.
Leeds United announced their released and retained list this week – with the likes of Mirco Antenucci, Scott Wootton and Lewis Walters all leaving the club.
The statement also announced that three loan players at the club were also on their way out of the club.
Regarding the latter HITC Sport understands that Cardiff are not expecting any move to bring the midfielder in permanently, despite Leeds having a purchase option for the player.
In September Adeyemi spoke to the Yorkshire Evening Post, who also reported the fixed-price option in his contract, and explained how he would like to stay at Elland Road permanently:
“I think a lot depends on how I perform.
“I’ve got to make sure I get myself in a position where the club are thinking about me in terms of a long-term proposition.
“Obviously I’m still under contract with Cardiff and I don’t really know what the thoughts are there but I’m thoroughly enjoying my time here – as much as I’ve enjoyed playing anywhere else. It’s definitely something I’m thinking about.”
The 24-year-old started the season as a regular for Leeds but has fallen down the pecking order since the arrival of fellow loanee Bridcutt and Toumani Diagouraga from Brentford.
He only played five games for Leeds since the turn of the year and has not done enough to convince Leeds to pay for his permanent services.
Cardiff have just appointed Paul Trollope as their new manager and he might decide Adeyemi has a chance in the Bluebirds first-team going forward.