Robbie Keane opened his scoring account for Celtic in the 4-2 win over Dunfermline and celebrated with a trademark cartwheel in front of the travelling Celtic support.
The on-loan Spurs striker replaced Marc Crosas at half-time and inspired Tony Mowbray's side into the last eight of the Scottish Cup after a typical rollercoaster display from the Hoops.
Mowbray made seven changes to the side that lost 1-0 to Kilmarnock, with Keane on the bench alongside Aiden McGeady.
Celtic face Hearts on Wednesday followed by Aberdeen on Saturday, with Keane revealing that the heavy schedule was the reason that he had started the match on the bench.
He said: "I spoke to the manager and we agreed before the game that I'd play the second half.
"I got 90 minutes in the last match; we have a big game on Wednesday and it's about the team and a squad. The lads who came in were superb.
"For a long time I've dreamed of scoring for Celtic so it was nice to score today, but the most important thing was getting a win.
"It's never easy coming to places like this; Dunfermline made it difficult for us but luckily enough in the end our quality came through.
"Scoring goals will give everyone confidence, it's important to get wins under our belt. Hopefully this win will set us up nicely for Wednesday."
Diomansy Kamara was one of three outfield players to retain his place after the Kilmarnock defeat and showed his class with a spectacular 20th minute drive to put Celtic in front.
Seventy-three seconds later Dunfermline levelled through David Graham before Andy Kirk put the home side in front from the penalty spot, although Morten Rasmussen equalised before the interval.
Rasmussen forced Callum Woods into an own goal in the 59th minute before Keane was decked by Austin McCann, from where the striker picked himself up to slot home the penalty.
That penalty may carry extra significance with Aiden McGeady, Barry Robson, Scott McDonald and Marco Fortune all having missed penalties for Celtic this season. The quarter-final draw for the Scottish Cup will be held at lunchtime on Wednesday at Hampden Park, but Mowbray's thoughts are already on facing Hearts later that day.
He said: "Wednesday will be a hard game but hopefully the extra expectation and tension lifts the group.
"Hopefully our supporters will come out in numbers to support the team and see Robbie perform.
"I'm delighted Robbie is here because he adds that finesse in the final third that sometimes makes that difference in games.
"There were some moments of magic when he sat players on their backside in the box, in tight areas -- he has that special quality."