Celtic suffered a stunning Champions League play-off collapse as LASK overturned a 3-0 first-leg deficit to win 5-4 after extra-time and send the Scottish champions crashing into the Europa League.

In one of the worst nights in Celtic's European history, the Hoops were up 4-0 on aggregate after Callum McGregor extended their 3-0 first-leg advantage early on in Austria.

Despite wobbling after goals from Moses Usor, Robert Ljubicic and a Samuel Adeniran stunner, Celtic were minutes from booking a place in Thursday's League phase draw before second-half substitute Florian Flecker headed home a 90th-minute equaliser to force extra-time.

Full of all the energy and desire that Celtic whimpered at the sight of, the momentum belonged to the Austrian champions. Adeniran struck from range again in the 109th minute to put LASK in front on aggregate for the first time.

He very nearly added salt to Celtic's wounds when he stepped up for a penalty moments later, after Reo Hatate fouled Krystof Danek deep, but Viljami Sinisalo kept the spot-kick out to give his side a lifeline.

It was a lifeline that went begging as the full-time whistle confirmed Celtic would miss out on the Champions League for the second consecutive season. Last season it was defeat on penalties at this stage to Kairat Almaty.

This year's failure, given the context of a four-goal aggregate lead, will take considerably longer to move on from.

Once again the Hoops will be involved in the Europa League league-phase draw on Friday.

The key moments from Raiffeisen Arena

McGregor issues apology to Celtic fans

Celtic's Callum McGregor speaking with Amazon Prime:

"We got what we deserved. I thought we were passive all night. We actually looked scared to go and win the game.

"To be honest, I don't think we were that good in the first leg either and we kind of got away with it. But then you're up 3-0 and think you have a chance. When you play like that, you can't have any excuse whatsoever.

"We have to suck it up. We apologise to the supporters and to the club because there's no way we should lose that game. Now we have to see what character we have.

"You can't lose the game by such a big margin and look for excuses elsewhere. This is where we see what people are made of in terms of what we achieve this season."

What next for Celtic...

Celtic will play in the Europa League this season. The Europa League league phase draw - involving Bournemouth, Sunderland and Crystal Palace - takes place at 12pm UK time on Friday