Celtic have been knocked out of the UEFA Champions League after squandering a commanding four-goal aggregate lead, losing the second leg of their play-off tie 5-1 to LASK in Austria and falling 5-4 on aggregate.

The Scottish side arrived at the second leg seemingly in complete control, sitting on a 4-0 advantage built from the first leg. What followed was one of the most dramatic collapses in the club's recent European history.

LASK produced a stunning fightback to overturn the deficit across 90 minutes, condemning Celtic to elimination from the Champions League for a second consecutive season — once again failing to reach the lucrative group stage of Europe's premier club competition.

The result is a severe blow to Celtic's European ambitions and raises serious questions about the squad's ability to compete at the highest continental level. A tie that looked all but over at half-time in the tie's aggregate standing became an astonishing reversal that will resonate far beyond Austrian borders.

Celtic now drop into the UEFA Europa League, where they will continue their European campaign after failing to secure a place in the Champions League main draw for the second year running.