Rangers first-team coach Ian Durrant is hoping they do not lose the services of Nikica Jelavic in January.
The Croatia international has previously been wanted by Leicester and there is renewed talk they could return with a bid.
Gers are already without playmaker Steven Naismith for the rest of the season and Durrant feels looking another key player would be difficult as they bid to win a a fourth successive league title.
"Of course it would be [a problem]. It's hard enough losing one of your top players. I just hope it doesn't happen," commented Durrant.
"I see Nikica on a day to day basis and I feel that he wants to do well for our club and long may that continue. We want to hold on to everybody.
"Basically it's down to the player. If the player decides he wants to go and try something else, it's up to him.
"But the manager has spoken to Nikica and the likes of Allan McGregor and Steven Davis, and we are delighted they are still playing with Rangers."
Meanwhile, Durrant has played down speculation linking Rangers with a move for Honduran striker Jerry Bengtson.
"That one today, the Honduran, was mentioned during the week but it's purely just paper talk," he continued.
"We are always looking. We can always enhance our squad and if the players are there we have to try to get them."