Livingston boss David Martindale tells BBC Sportsound: "Everything that could go wrong went wrong in the second half. I've got to give credit to Inverness, they came here with a game plan and executed it very well.

"They scored two fantastic goals, took their chances in our box and we never. They deserve the victory and we didn't.

"It didn't look like a Livingston team. We started well but they scored and we chased the game. Our shape was all over the place for the first two goals and I need to reflect on that.

"I could go in there and shout and bawl. I didn't do that, it won't help anyone. Emotions are high, we're all bitterly disappointed. We need to sit back and reflect."

Image source, SNS

Meanwhile, Raith Rovers manager Ian Murray tells BBC Sportsound his side were "bang on it" from the off against Motherwell.

"Second half we weathered a 10-15 minute storm, which we expected," Murray says. "We conceded a really sloppy goal, but after that we were excellent.

"The resilience of the players is incredible, their character this season has been remarkable, I really can't speak highly enough of them.

"We are ecstatic to get through to the next round of the Scottish Cup and we look forward to the draw now. We'll enjoy this one tonight."

An emotional Liam Kelly tells BBC Sportsound he is "gutted and embarrassed" at his, and his team's, performance against Raith Rovers.

"We've let so many people down again today," the Motherwell captain says. "A huge travelling support had no right to be here in there numbers today and we have let them down massively.

"Collectively as a team, we are not good enough. Confidence is really low but only ourselves can get us out of this situation. It's really tough but we'll fight, we'll grind and we need to stick together."

On manager Stevie Hammell, Kelly added: "We've let the manager down. He's been good to a lot of us, even when we haven't been playing well. He was really disappointed but we will absolutely keep grafting for him."

Let's get some reaction from the earlier kick-offs...

Daizen Maeda's close-range finish is the difference between the sides in a close contest at Celtic Park.

St Mirren are still well in this. The big negative for Celtic is the shoulder injury sustained by Kyogo early in the half.

Image source, SNS

Another Celtic chance as half-time approaches.

It's Aaron Mooy with the cross again to the front post and Jota is there, but the forward can't get his fancy flick on target.

Fantastic block from Curtis Main keeps this at 1-0.

A corner makes it way to Carl Starfelt at the front post and the centre-back smashes one from close range.

Main is there to get a block on it and sees the ball go just over.

As five minutes of stoppage time are shown, Ryan Strain lofts a ball into the Celtic box.

Tony Watt gets there with his head but can't get it on target. Moments later, Alex Gogic smashes one over from range.

There's a VAR-related stoppage after Alistair Johnston catches Mark O'Hara with his hand.

Looks completely accidental and referee Steven McLean eventually waves play on.

Declan Gallagher slides in to clear a pass, which only goes as far as Callum McGregor.

The Celtic captain attempts an ambitious one first time but it's too weak.

Ouch!published at 40 mins

40 mins

Celtic 1-0 St Mirren

Alex Greive took a sore one in that challenge with Joe Hart.

He's going to have to make way for former Celtic striker Tony Watt.

Kheredine Idessane
BBC Sport Scotland at Celtic Park

The St Mirren fans are in good voice despite being a goal behind in this cup tie. Why? They've seen Celtic be somewhat scrappy in possession, with a few misplaced passes and quite a few moves breaking down.

Since going behind, Trevor Carson has had nothing to do in the visitors' goal and while there's just a single goal in it, the Saints fans and players will have hope.

Keanu Baccus has been fantastic so far as he wins another challenge.

Alex Gogic picks up the ball and tries to play one over the top to Alex Greive but Joe Hart gets there first.

St Mirren swarm over Aaron Mooy, forcing the Celtic man to lash a pass out of play.

Alebit they're still behind in the game, the visitors' intensity is there. How long can they keep it up?

For a minute it looks like St Mirren have a real opening as Curtis Main charges forward.

But he can't find his strike partner Alex Greive with a through ball.

St Mirren's midfield are putting some shift in but trying to build anything into the attack is proving an issue.

While this stays 1-0 they're in it, though...

Liel Abada has made a real impact since coming on for the injured Kyogo.

This time he reaches the bye-line before crossing to the front post where Daizen Maeda glances over.

This Celtic side just don't give you a minute but St Mirren are putting in the hard yards to try match them.

A decent cup tie, this.

Kheredine Idessane
BBC Sport Scotland at Celtic Park

We've seen several bursts of pace from Daizen Maeda so far, scorching his way down the left wing.

His move to the central striking position paid immediate dividends. An excellent pass from substitute Liel Abada, great run into the box from Aaron Mooy and a nice clipped finish from Daizen Maeda.

Wouldn't fancy a 100m dash against Maeda, would you?