Celtic came from two goals down to snatch a dramatic victory over Kilmarnock, with Julian Araujo firing a stoppage-time winner to cap a thrilling turnaround in Martin O'Neill’s 300th match in charge of the Glasgow side.
Kilmarnock looked firmly in control at the break after Tyreece John-Jules and Joe Hugill struck to give the hosts a deserved two-goal lead.
John-Jules opened the scoring with a composed finish after cutting inside the box, before turning provider with a delicate cross that Hugill headed over goalkeeper Kasper Schmeichel.
Celtic responded strongly after the interval following a triple substitution that shifted the momentum.
Sebastian Tounektipulled one back with a trademark finish into the far corner, before Benjamin Nygren stabbed home his 13th league goal after Kilmarnock failed to clear a long throw.
Both sides pushed for a winner, with John-Jules rattling the crossbar from a free-kick, but Celtic continued to apply pressure.
Deep into stoppage time, the breakthrough arrived when Bournemouth loanee Julian Araujo swept home from close range after defensive hesitancy in the box, sparking wild celebrations among the travelling support.
The win extends Celtic’s unbeaten run to 10 matches and lifts them above Rangers into second place as they continue their title defence.
Kilmarnock, despite another encouraging display under new boss Neil McCann, remain three points behind third-bottom St Mirren and were left to rue another late collapse.
For Celtic, it was another reminder of their resilience under O’Neill - and another chapter of what fans are already calling “O’Neill Time.”
Kilmarnock manager Neil McCann: "I am not devastated - I am just angry. It is a sore one to take.
"Lost a game when I thought we deserved something out of it.
"There's a lot of disappointment there - so many good things within the match for us. It is an enormous amount of added time - seven minutes. I'm not sure where they got that from."
Celtic manager Martin O'Neill: "The spirit the players has been absolutely fantastic.
"I managed, coached, a really top quality side here 20-odd years ago who had loads of spirit, loads of resilience, loads of ability and these lads here are emulating that in many aspects and sometimes surpassing.
"It was a wonderful second-half performance for us. You can't keep doing that. We've got to put in the full 90 minutes."