Mason, 23, spent a large portion of the 2013/14 season on loan at the Reebok, scoring 6 goals over two very different loan spells. His first 8 game run at the club was a disaster with the player looking out of his depth when played as the lone (loan) striker by manager Dougie Freedman.
In his defence the second period was far more indicative of the lad's talent - partnered with Middlesbrough loanee Lukas Jutkiewicz, Mason hit six goals in eight to help lift Wanderers from the relegation mire into the glamour and glory of 14th place.
This news comes as a contradiction to Wanderers boss Freedman who this week told the BEN:
"At the moment, Cardiff are saying Joe Mason is their player and so there isn't a whole lot I can do about it," he said.
"He came here and did fantastically well but realistically I'm now looking at the situation and thinking ‘which targets can we really get?'
"Being realistic, and at this late stage in the transfer window, I can see Joe being needed at Cardiff and not being surplus to requirements.