Ange Postecoglou faces a red tape race for Alistair Johnston and Yuki Kobayashi to be included in his plans to face Rangers.
The Hoops signed the duo earlier this month and they have been training with their new-team mates for weeks and adjusting to their new surroundings. However, despite being registered with their new club, clearance doesn't come through until after January 1 meaning any involvement at Ibrox will come against the clock.
Tomoki Iwata has also signed on the dotted line but he was 'zero' chance of playing with the midfielder still in Japan. Postecoglou has been handed a major fitness boost over Greg Taylor but Sead Haksabanovic misses out for Celtic. The Parkhead gaffer said: “Tomoki is in Japan so there is zero chance he will play. With Alistair and Kobayashi, they are available like everyone else.