What a rollercoaster of a night at Celtic Park.

They did it the hard way, but Martin O’Neill’s men have progressed to the next round of the Scottish Cup with an extra-time victory over Dundee.

The Celts looked to be heading out of the tournament until, literally, the final seconds of the game, when Junior Adamu marked his Celtic debut with a goal of seismic importance.

The provider of the equaliser, Sebastian Tounekti, then put Celtic in front just minutes into extra-time, and that was enough to seal progression on a nerve-wracking evening.

O’Neill has reacted to the game and its key headlines.

Is Sebastian Tounekti’s cameo against Dundee a turning point in his Celtic career?

Sebastian Tounekti of Celtic controls the ball during the Premier League match between Celtic and Heart of MidlothianPhoto by Ian MacNicol/Getty Images Martin O’Neill on Celtic vs Dundee

Tounekti and Adamu, as well as Benjamin Nygren, Marcelo Saracchi and Luke McCowan all made a massive difference after coming on.

It really was like watching a different Celtic in the extra-time period.

READ MORE: Celtic player ratings vs Dundee as Martin O’Neill’s subs save Celts from nightmare upset

Celtic v Dundee - William Hill PremiershipPhoto by Ian MacNicol/Getty Images

Speaking to Premier Sports after the game, O’Neill was full of praise for Tounekti, and also discussed the fan boycott in action at the match.

He said: “As you can tell, I’m really drained.

“I thought Dundee played very well, but we found a way to win the game. First of all, we find a bit of resilience in the last (seconds) of added time, and we get the goal.

“I’m just genuinely, really, really, proud of the team; the manner in which they kept going and kept going. It wasn’t looking as if it was going to be our evening at all.

“And we found a way to, first of all, save the game, and secondly to win.”

On Tounekti, and firstly Adamu, the interim boss said: “It was great. Brilliant for him to score a goal.

“First of all, it saves the game for us. Seb coming on, he made a big difference. Big, big difference. Trying to take people on, take players on, trying to dribble past a few players.

“He was a game changer for us.”

Lastly on, connection with the fans, O’Neill said: “A disunited Celtic is not what anybody wants.

“And I think the sooner we can resolve the differences between all parties, the better.”

How on earth do you begin to describe that…!

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