In the Europa League this evening, Rangers bring a 4-2 first leg lead into their last 32 tie with Borussia Dortmund at Ibrox.
That match has an 8 o'clock start.
Celtic have work to do to progress to the next round of the Conference League, as they trail Bodo Glimt 3-1 ahead of their encounter in Norway.
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Kick off is at 5.45.