England man may return from Brazil to begin a spell at a new club, with at least two Premier League big boys interested.
BBC Sport are reporting that club captain Steven Caulker is available for transfer following the side's relegation to the Championship.
He and Chile captain Gary Medel, two of the club's biggest transfers last summer, apparently had relegation release clauses written into their contracts during negotiations.
Caulker signed for around £8 million from Tottenham in June 2013.
With both players possibly on their way to the World Cup in Brazil this summer, it is fair to assume that a season in the Championship would represent a bit of comedown.
The Cardiff skipper, who has notched an impressive 5 goals after playing every minute of the campaign so far, receiving just one booking, had already stated that he would be at the club next season to help the Bluebirds win promotion at the first attempt, telling the press: "I signed a four-year deal here so I'll be looking to get us back promoted next season."
Whether Caulker, or Cardiff, will be able to resist a big money move to a more secure Premier League club will likely only be known come the start of the season.
But with former club Tottenham already rumoured to be interested in recruiting their former academy graduate, with Premier League title challengers Liverpool also circling, a switch out of the club may be more attractive than visits to Griffin Park or Dean Court next year.
Both Premier League giants are looking for central defensive reinforcements, with questionable defending costing the teams dearly over the course of the season.