Cisse has spent the past month training with the Championship outfit, and after impressing McClaren, the former England boss has revealed that there is the possibility of a short-term contract for the Mali international.
The 52-year-old told the Derby Telegraph: "Kalifa is still with us and he is getting better and fitter each week.
"He played at Huddersfield and did very well. We had a chat with him and we said to him 'keep training with us' - which he is happy to do - and we will see where it leads.
"It suits both parties. It is a win-win situation for both of us. The possibility of a short-term deal could be there. We'll see how it goes."
The 29-year-old has been without a club since leaving New England Revolution.