All four are already have lengthy contracts but with interest in the quartet expected when the transfer window re-opens in the summer, the City Board want to ensure that the players have committed themselves to the club.
Scott Dann to be offered a longer contract
"They have all got good, long term contracts but we recognise that they have done very well," said Chris Coleman to the CT.
"We have been in negotiations with them and will sit down with them all with a view to extending their contracts."