Barry Maguire applied the killer fourth goal last night as FC Utrecht killed off Celtic's Europa League hopes.
The 20-year-old Dutch-born midfielder, whose parents are Irish, turned down an invite to play for Don Givens U21 side last season and has represented both Ireland and Holland at youth team level.
Nine minutes after replacing Nana Asare, the midfielder drilled in a 20-yard effort to put the Dutch club four up and officially bury Celtic's hopes.
Two penalties from Ricky van Wolfswinkel in the first 20 minutes wiped out Celtic's first-leg lead, and the Hoops looked capable of losing a goal every time Utrecht gained possession.
The defeat brought back memories of Celtic's 2-0 Scottish Cup defeat against Ross County last season when the then interim boss Neil Lennon slated the team for pathetically going out of the three cup competitions.
Lennon has a 100pc record in the SPL, steering Celtic to 10 victories, but he has also watched his side lose three cup ties to Ross County, Sporting Braga and now Utrecht.
After the defeat the Celtic boss said: "I never had any illusions about where we are. I was always wary of this tie but didn't think we would play as badly as that. The mentality problem is there. You can't go on about history and our record in Europe because it's a different manager, different team. But we still make the same mistakes away from home and it has to be a mentality thing.
"I've said to them I watched Chelsea play Wigan and they are quite prepared to put their bodies on the line and block things and put their foot in. I'm not just saying that about the back four; it was endemic through the whole team.
"We backed out of challenges and didn't want to close people down. I will have to look at the overall performance and see where we went wrong. We have to improve quickly because this will be a sore one for me for a while."
Lennon's anger is likely to see up to six changes in the team to face Motherwell in the league on Saturday.
Meanwhile, Marco Fortune is set to join West Brom today, with Anthony Stokes coming in as a direct replacement, and Daryl Murphy is also likely to start in place of Georgios Samaras, who is interesting a couple of clubs in Spain.
At the back, loan keeper Fraser Forster will replace the accident prone Lucasz Zaluska, who has been in goals for Celtic's three most humiliating defeats of the year -- the 4-0 defeat by St Mirren that cost Tony Mowbray his job, the 2-0 Scottish Cup humiliation to Ross County and last night's fiasco in Holland.
"Through the middle of the team we were poor. It was a poor performance and I take responsibility for it," concluded Lennon.