Celtic closed the gap on Scottish Premiership leaders Hearts to just three points after Kelechi Iheanacho fired home a dramatic late winner against Dundee.
Martin O’Neill’s side made a strong start and took the lead inside eight minutes when Yang Hyun-Jun got a decisive touch on Benjamin Nygren’s close-range effort.
Celtic dominated the opening period and created several clear chances, but striker Tomas Cvancara was unable to convert, missing a series of gilt-edged opportunities.
That wastefulness proved costly after the break.
Dundee were awarded a penalty following a VAR review for handball against Colby Donovan, and captain Simon Murray stepped up to calmly level the score.
Celtic struggled to regain their rhythm for much of the second half, but with time running out, they found a way through.
Substitute Iheanacho reacted quickest after a defensive lapse, smashing a left-footed shot past goalkeeper Jon McCracken to seal all three points.
Dundee’s misery was compounded late on when Ryan Astley was sent off for bringing down Yang, reducing the hosts to 10 men.
Following Hearts’ earlier draw, Celtic now sit three points off the top, while also trailing second-placed Rangers by two.
Dundee, meanwhile, remain five points clear of the relegation play-off spot.
While not at their fluent best, Celtic once again demonstrated their resilience to grind out a crucial result.
Having lost their previous three visits to Dundee this season, they started brightly and deserved their early lead.
However, their inability to convert chances remains a concern.
Cvancara endured a frustrating outing, missing multiple opportunities - including striking the post and firing over from distance - before being replaced by Iheanacho just before the hour mark.
Celtic’s defensive vulnerabilities also persist, with the side now conceding in eight consecutive league matches - their longest such run in two decades.
Yet, when it mattered most, they delivered.
Marcelo Saracchi’s dangerous cross caused problems in the Dundee defence, and Iheanacho capitalised after a failed clearance to snatch victory.
O’Neill had stressed before kick-off the importance of staying within touching distance in the title race - and despite an imperfect display, Celtic did just enough to remain firmly in contention.
Dundee head coach Steven Pressley: "I don't think we started the game in the fashion we hoped. That was credit to Celtic.
"We settled into it and especially in the second half we played particularly well. We didn't come out to sit in, we wanted to impose ourselves on the game and that takes bravery.
"To stay in this league, you're going to have to endure difficult games and difficult periods.
"The last six games are going to challenge us greatly. We need to attack them and keep showing the bravery we showed today."
Celtic interim manager Martin O'Neill: "I thought we played brilliantly in the first half, got our goal and should have got two, three or four. You always felt it would come back to haunt you and it did.
"They got their tails up after the penalty and it was really hard work.
"But we created another chance or two and Iheanacho puts one in the net.
"I think overall we deserved to win the game but it was always going to be tight. And we made it really tight."
