The 28-year-old, capped three times for Scotland, 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 to his former Leith stomping ground.
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, still has a good relationship with people at the club so we wanted to help him out."
Hibs travel to Tannadice on Sunday to face Dundee United looking to re-establish themselves as serious contenders for second place in the SPL.
The Edinburgh outfit had climbed to such lofty heights before the festive period but one win in the 10 games preceding their narrow 1-0 victory over St Mirren last Saturday left them fearing a drop out of the top six altogether.
However, their win in Paisley - just five days after losing meekly to St Johnstone in a 3-0 home defeat - has moved them back up to fourth in the standings and just three points off Motherwell in the runners-up slot.
Now midfielder Tom Taiwo claims the confidence produced by the win over the Buddies can spark a push for Europe and that 'best of the rest' tag behind runaway leaders Celtic.
He said: "The mood in the changing room is a lot more upbeat. After the St Johnstone game, the training ground wasn't a brilliant place to be, with a lot of unhappy faces.
"But that showed we need to develop a lot more consistency and that made the St Mirren game even more important.
"All the teams in the top six, apart from Celtic, are struggling for consistency.
"The side that can start to string together two or three wins more often will be the ones who finish second and we believe that can be us."