According to the Evening Times, Cardiff are willing to offer up South Korean midfielder Kim Bo-kyung in exchange for Celtic right back Adam Matthews.
Celtic were linked with a move to sign the 25-year-old in the summer, but no deal was done - and having played just 136 minutes of Championship football, it seems that he's now available for transfer.
A creative central midfielder, Kim would be a sensible target for Celtic given that the Bhoys have been linked with a host of midfielders, including Everton's Francisco Junior and Rosenborg's Mix Diskerud.
Signing Kim would give manager Ronny Deila the chance to finally worth with the South Korean international, but there's a catch - they may have to send defender Matthews in exchange.
The 23-year-old Welsh international started his career with Cardiff as an eight-year-old, and only left in 2011 aged 19, after Celtic agreed a pre-contract agreement with him.
The recent injury woes of fellow right back Mikael Lustig may mean that Celtic are reluctant to let him leave, but if Matthews wants to return to Wales, then it could be a good move for all parties.
Kim would be a good addition, but Deila needs to first assess whether he can afford to lose Matthews, and if there's a replacement out there that would sign for Celtic.
If Deila does identify a right back who can come in Matthews' place, then the deal could be a go-er - but until then, Celtic should resist temptation to sell.