"It's something we continue to look at but if it doesn't come it doesn't come," said boss Malky Mackay.
City have lost Haris Vuckic today as he returns to Newcastle but City hope he'll return ASAP.
"Most of the people being looked at will be Premiership players and it will be players that are maybe not going to be involved in the squad in the last six, seven weeks of the season.
"That's the decisions clubs have got to make and you're at their mercy.
"We just keep monitoring what goes on and if something arises quickly we will have done our homework on it anyway and we decide whether we're going to do something or not.
"If not then we keep our squad as fully fit as we can and they're a great group anyway."
Cardiff face Hull City tomorrow at Cardiff City Stadium a win would see the Bluebirds move up to 4th place.