Celtic beat Rosenborg 1-0 in Europa League Group B on Thursday evening.
Scott Sinclair's header from a James Forrest cross means Brendan Rodgers' side will qualify for the last 32 if they avoid defeat at home to group winners Salzburg on matchday six.
Rangers remain in contention to progress from a very tight Group G following a 0-0 draw against Villarreal at Ibrox. Steven Gerrard's men had Daniel Candeias sent off late in the first half but earned a crucial point and victory away to Rapid Vienna would see them through.
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