Odsonne Edouard scored a brace to help Celtic to a 3-1 victory in the first-leg of their Champions League second round qualifying tie with Rosenborg in Glasgow.
Rosenborg - whose preparations were disrupted by the sacking of their manager last week - took a surprise lead on 15 minutes through Birger Meling who finished aplomb with former Arsenal forward Nicklas Bendtner registering the assist.
But Edouard, Celtic's record signing, came to the rescue as he levelled the scores only a minute before the half-time break with a classy goal.
A change in tactics from Celtic at the interval prompted a much improved showing in the second-half, and they edged ahead with their first attack when Olivier Ntcham's beautiful curled effort from the edge of the box left Andre Hansen helpless.
Brendan Rodgers' side spurned several more chances but finally registered their third of the evening on 75 minutes when the hugely impressive Edouard capped a terrific performance as he lobbed Hansen for his double.
Celtic will hope to finish the job when they travel to the home of the Norwegian champions next Wednesday for the second leg. Should they avoid a shock defeat, they will meet AEK Athens in the third round qualifying stage.