Amy Canavan
BBC Sport Scotland at McDiarmid Park

Pre-match, Martin O'Neill said he was concerned about the game because St Johnstone are playing so well.

If he was concerned then, he'll be awfy concerned now.

There's a lot of grappling going on in the box as Kevin Kelsy attempts to meet Badredine Bouanani's teasing ball.

St Mirren survive. Again.

Ryan Carr blasts way over the bar after St Mirren work half a chance really well.

Poor strike, but the visitors are finally settling into this.

Djeidi Gassama and a fair few home fans want a penalty as the Rangers winger feels he's been fouled by Calvin Ramsay when making a run into the box off the ball.

Referee Don Robertson and the VAR team are not interested.

Image source, SNS

St Mirren's midfielders are picking up areas between Rangers' defence and midfield.

The away side have started this half well.

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Laboured, and the changes probably haven't helped Celtic. I've got no doubt that Martin O'Neill will go to the bench.

St Johnstone are keeping nice and compact through the middle. There's not much space for Celtic to play in there.

Djeidi Gassama jinks in off the left and runs along the edge of the St Mirren box before smashing narrowly wide of the target.

Rory Loy
Former Rangers and St Mirren striker on BBC Sportsound

Craig McLeish lamented that the last time, St Mirren were at Ibrox. Rangers were clinical, scoring from almost every chance created.

It's been the complete opposite tonight.

I think the Rangers fans have liked what they have seen in terms of play, but they just need to start taking their chances.

Positive start to the second half from St Mirren as the ball is progressed up the left and Declan John delivers, but it's just a touch too high for Nikolas Agrafiotis.

As the players get a rest in Perth, we're back under way at Ibrox.

Will Rangers find a way through? Or do St Mirren have other ideas?

Callum Davidson
Former St Johnstone manager on BBC Sportsound

Celtic look like they've got five changes. Players haven't had a lot of minutes, some of them.

St Johnstone have been terrific. Their pressure's been good.

A keenly contested but ultimately goalless first half in Perth.

St Johnstone had the best opening when Joel Cotterill struck from around eight yards, forcing a save from Celtic's debutant goalkeeper Sam Johnstone.

Haissem Hassan has been lively for Celtic and tested Toby Steward early on.

Image source, SNS

St Johnstone are giving as good as they're getting and Enes Alic tries an ambitious effort from wide left that drifts out.

Cheick Diabate and Haissem Hassan are in a foot race and St Johnstone's Diabate shows strength to hold off the Celtic winger, otherwise Hassan was in on goal.

Matty Todd goes down under Auston Trusty's challenge at the other end but the referee is not having that.

Over their past 135 minutes of football, Rangers have accumulated an expected goals rating of 5.75.

They have scored just once from that, a goal that was gifted to them by Motherwell keeper Alex Paulsen.

Image source, SNS

Sebastian Tounekti's trickery gets him clear on Celtic's left but his pass across the box does not find a team-mate and then Haissem Hassan fouls a St Johnstone defender.

Jacob Chapman collects a scruffy attempt from Nicolas Raskin and the half-time whistle blows with St Mirren somehow still level.

The visitors have posed a threat at times, but it's another tale of profligacy so far for Rangers, who have failed to score from 13 shots.

Image source, SNS

Celtic threaten at a corner and the ball is headed around before Callum McGregor hooks in a shot that is deflected wide.

Another corner comes in and Toby Steward has to punch that one out.

The third corner is not as troubling for the hosts.

Djeidi Gassama and James Penrice combine well, but the latter can't get a shot away in the St Mirren box.