Postpublished at 15:39 Greenwich Mean Time 11 February
St Mirren 0-2 Celtic
Time's running out for St Mirren.
Approaching the now or never stage.
Watch live coverage & listen to Sportsound commentary above
Shankland, Vargas & Nieuwenhof put visitors three up in opening 21 minutes; Frizzell replies before Shankland dinks fourth
Scottish Cup quarter-final draw - Morton v Hearts, Celtic v Livingston, Aberdeen v Kilmarnock, Hibs v Rangers
FT: St Mirren 0-2 Celtic - Scottish Cup holders into quarter-finals with goals from Kyogo & Maeda
FT: Dundee 2-1 St Johnstone - hosts fight back for Premiership win with McCowan penalty & late McGhee strike after Smith opener
Nick McPheat
St Mirren 0-2 Celtic
Time's running out for St Mirren.
Approaching the now or never stage.
St Mirren 0-2 Celtic
Oh and Nicolas Kuhn are on for Celtic.
I can confirm the former doesn't have his bare feet out.
Luke McCowan
There's a long old delay after plenty of gamesmanship from Dimitar Mitov and a few St Johnstone defenders.
It doesn't bother McCowan, he slams it home of the post!
A brilliant penalty and, probably, no less than Dundee deserve.
But the decision to award a spot kick, hmm...
Dundee 0-1 St Johnstone
David Munro is across to the VAR screen - not entirely sure why.
Let's have a look... Liam Gordon slaps Amadou Bakayoko in the face as the corner comes in. I would describe that as... soft.
But it's a penalty!
Dundee 0-1 St Johnstone
Michael Mellon is on for Dundee, while Sven Sprangler takes to the pitch for St Johnstone.
Perhaps two of the finest names in Scottish football.
St Mirren 0-2 Celtic
St Mirren are pushing for a way back into this.
Mikael Mandron hammers one, it takes a nick, then Joe Hart catches.
St Mirren 0-2 Celtic
James Scott runs off the shoulder and lets one fly from a tight angle, but it's flashed across goal and wide.
St Mirren 0-2 Celtic
A shot deflects kindly into the path of Jaden Brown, whose offside anyway, but he can't direct his effort on goal.
St Mirren 0-2 Celtic
Keanu Baccus' eyes light up at the edge of the box.
His shot is on target but it's so tame.
Dundee 0-1 St Johnstone
Joe Shaughnessy is the next to go close.
Aaron Donnelly crosses from the left and the Dee skipper heads just wide.
An xG of 1.74 for Dundee - and still no goal.
Dundee 0-1 St Johnstone
From the resulting corner, St Johnstone hit the bar!
There was whole lot of bodies in there, but I think it's Andy Considine who powers a header off the woodwork.
Dundee 0-1 St Johnstone
Connor Smith and Max Kucheraivyi are on for St Johnstone.
Not the moves you'd expect if St Johnstone were trying to stem the flow of Dundee chances.
Instead, they create a brilliant chance! Kucheraivyi dinks a cross in that Smith heads back to Adama Sidibeh, and his bicycle kick is tipped just over.
This game, man.
St Mirren 0-2 Celtic
Stephen McGinn
Former St Mirren midfielder on BBC Sportsound
That's a massive chance missed.
It's all about getting a goal back for St Mirren, can they use that as a bit of a kick-starter?
St Mirren 0-2 Celtic
Greg Kiltie, you have to score!
The St Mirren man doesn't make a clean enough connection with his header and a golden chance goes to waste.
St Mirren 0-2 Celtic
Andy Burke
BBC Scotland at SMISA Stadium
"When the Celts go up to lift the Scottish Cup we'll be there," rings out from the away end.
The Celtic fans think their team is well on the way to the quarter-finals now.
Real sense of deflation among the St Mirren fans. Their team has competed well here but it is a long way back now.
St Mirren 0-2 Celtic
Stephen McGinn
Former St Mirren midfielder on BBC Sportsound
St Mirren left so much out there on the pitch in the first half, I was worried if they would be able to keep up that level of intensity.
Dundee 0-1 St Johnstone
Dundee are piling on the pressure. Jordan McGhee is the latest to drill a shot into a cloud of St Johnstone bodies and appeal for handball, but it's just a corner.
The cross comes in and Dara Costelloe places his back-post header just wide. Surely, surely, it's a matter of time.
St Mirren 0-2 Celtic
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Celtic were desperate for that second goal, just to have that cushion.
It's an easy task for Maeda, he just has to divert it into the goal.
They're in a great position now.
Daizen Maeda
Luis Palma crosses, Matt O'Riley cracks a half-volley off the bar, Maeda buries the rebound.
It's fairly straight forward for a Celtic side who are well on their way to the last eight.
Dundee 0-1 St Johnstone
One change at the break and it comes for the hosts. Dara Costelloe is on for Zach Robinson, who took a knock in the first half.
Costelloe spent the first half of the season on loan at St Johnstone.
Dundee have started strongly again, with that man Costelloe whipping in a beautiful delivery. It's just about dealt with by Kerr Smith.