Rangers host Borussia Dortmund at Ibrox this evening, kick-off 8.00pm, aiming to secure a place in Friday's draw for the last 16 of the Europa League.
Giovanni van Bronckhorst's men earned a superb 4-2 win in Germany last Thursday against the side currently sitting second in the Bundesliga.
Celtic are in Norway to face Bodo/Glimt in the second leg of their Europa Conference League play-off tie but trail 3-1 from the first leg in Glasgow.
It's a 5.45pm kick-off inside the Arctic Circle as Ange Postecoglou's team attempt to turn things round against the Norwegian champions.