Odsonne Edouard grabbed two goals as Celtic came from behind to beat Rosenborg 3-1 in the first leg of their Champions League second qualifier at Parkhead.
The Norwegian champions, who controversially sacked their manager Kare Ingebrigsten last week and replaced him with academy director Rini Coolen as interim boss, took the lead in the 15th minute through defender Birger Meling.
However, Brendan Rodgers' side showed their mettle and goals from striker Edouard and fellow Frenchman Olivier Ntcham just before and after the break put the home side in front.
Edouard, bought for a reported club record fee of £9million from Paris St Germain in the summer after a loan spell last season, stretched that lead with another well-taken goal in the 75th minute to give the Hoops a decent advantage to take to Norway next week.
The two sides met in the penultimate qualifier last season with James Forrest scoring the only goal of the tie in the return game in Trondheim and on the evidence of the first leg, the Scottish champions will fancy their chances of a repeat outcome.
There was tinkering to be done by Rodgers and Costa Rica's World Cup right-back Cristian Gamboa came in as replacement for suspended Jozo Simunovic while Scott Sinclair replaced Moussa Dembele who was ruled out of both legs with another hamstring complaint.
The visitors looked focused and the tie took an early twist when Rosenborg capitalised on a mistake by Jack Hendry to take the lead.
The centre-back advanced up the park only to see his square pass intercepted by skipper Mike Jensen who set Helland away and when he moved it on to Nicklas Bendtner his perfectly-weighted pass was guided low past Gordon by the incoming Meling from 14 yards.
In the 34th minute, amid growing Celtic anxiety, a penalty claim when right-back Vegar Hedenstad clashed with Parkhead midfielder Ntcham in the box was ignored by Belgian referee Bert Vertenten.
However, in the 43rd minute the mood inside Parkhead changed when Edouard controlled a Sinclair cut-back and stroked it past Hansen from eight yards and within a minute of the restart Ntcham took a pass from McGregor and curled the ball high into the net from outside the box to have the Hoops fans back on their feet.
The visitors were under siege as Celtic, urgent and energised, piled forward to increase their lead.
A third goal seemed inevitable and it came when Forrest sent Edouard racing through the middle and with supreme confidence he chipped Hansen to give the home side a deserved two-goal cushion, although it could have been three as Hendry's header from a McGregor free-kick clipped the bar before going over