Rangers take on Liverpool at Anfield this evening in part one of a double header - the sides meet again at Ibrox next Wednesday.
Giovanni van Bronckhorst's men go into the game on the back of a 4-0 win at Tynecastle while Jurgen Klopp's team drew 3-3 with Brighton at the weekend.
Rangers are looking for their first point in Group A after defeats to Ajax and Napoli so far.
Celtic face Leipzig in Germany on Wednesday with a 5.45pm kick-off, aiming to build on their 1-1 draw with Shakhtar Donetsk on matchday two.
Ange Postecoglou's men defeated Motherwell 2-1 on Saturday while Group F rivals Leipzig beat Bochum 4-0 in the Bundesliga.