The 28-year-old, capped three times for his country, has joined up with the Easter Park outfit in a bid to keep himself fit after being released by Middlesbrough at the end of January.
However, manager Pat Fenlon insists he simply does not have the money to offer the former Rangers player - twice a SPL winner with the Ibrox club - a return.
The Hibs boss said: "We have used up our budget in relation to players. We have given Kevin the facilities to come in and train and that's all there is.
"There are loads of players we would like to bring in if we had the money for it.
"Kevin is an ex-Hibs player and has been in training with us for the last few days and we're delighted to help him out. But at the moment there is nothing more than that.
"So he's only here to train. He is obviously looking at his own career. He has been here before and still has a good relationship with people at the club so we wanted to help him out."