And now St Mirren call for their back-up forwards, with Mikael Mandron and Toyosi Olusanya taking over from Lewis Jamieson and Jonah Ayunga.

Zander Clark, you lucky, lucky boy.

The Hearts keeper catches a harmless free-kick then inexplicably drops the ball.

Danilo has an empty net, just like Alex Cochrane in the first half, but smashes against a Hearts body on the line.

Chris Kane's coming on - that means St Johnstone now have a recognised striker on the pitch.

Diallang Jaiyesimi is off. He worked well up top against Celtic but has barely been seen in this game.

St Mirren have enjoyed the better of it in this second half, with Lewis Jamieson the latest to hit a tame effort at the St Johnstone goal.

This game desperately needs something to liven it up.

Oh Hyeon-gyu gets a huge round of applause as the Celtic striker is withdrawn after his double. Four goals in four appearances against Hibs, by the way.

Mikey Johnston also heads off, as Kyogo and the almost-forgotten Marco Tilio come on.

Image source, SNS

Double Hearts change as the play resumes.

Off go Nathaniel Atkinson and Jorge Grant for Yutaro Oda and Kenneth Vargas.

Finally, a chance in this second half.

Bojan Miovski's shot from inside the box is blocked, then Jamie McGrath is also denied by the Kilmarnock defence.

A bit of concern for Kilmarnock, as Brad Lyons is down receiving some treatment. The Northern Irishman limps off.

Rory McKenzie is on in his place.

Tyrone Smith
BBC Scotland

Kilmarnock have started the second half well, with most of the play in the Aberdeen half.

You get the sense the visitors are growing in confidence and belief they can get something out of this game.

Now it's St Johnstone's chance to threaten. Graham Carey has the ball on the right, he performs a few step-overs and teases a cross low towards the back post, but there's no striker there.

Might be because there's none on the pitch for St Johnstone right enough. 4-6-0 anyone?

That's an enormous chance for St Mirren but, again, they can't take it.

A cross from the Mark O'Hara on the right bounces and Greg Kiltie is the only man there but he puts his header straight at Dimitar Mitov.

Brian McLauchlin
BBC Scotland at Tynecaslte

The goal when it came certainly rocked the home side but the run from Abdallah Sima was superb and it was only the feet of Zander Clark in the home goal that denied the visitors a second.

Philippe Clement will certainly be the happier of the managers at the break but Steven Naismith has real fire-power to call on from the bench with Forrest, McKay, Oda and Vargas all available should he feel the need to throw on support for Lawrence Shankland.

Lewis Stevenson's catches the trailing leg of Alistair Johnston.

Not a lot of contact, but clumsy, and John Beaton says pen after a quick look at the monitor.

Kheredine Idessane
BBC Scotland at McDiarmid Park

I gave this the big build-up... And it's fallen flat on its face. No bones about it, this has been poor so far.

The lack of quality as disconcerting as it is disappointing. Lewis Jamieson should have scored for St Mirren after their press caught out Dan Phillips' attempt to play out from the back. Everything else was really a half-chance at best.

Looking for some football to break out after the interval. Please.

A surprising change at half-time for Celtic, as Nat Phillips comes on for Cameron Carter-Vickers.

Is there a niggle for the centre-half, or is Brendan Rodgers feeling confident enough to rest a crucial player with 45 minutes to go?

Martin Dowden
BBC Scotland at Celtic Park

Celtic could easily have settled this already. The early breakthrough helped them on their way and they've created enough outside Matt O'Riley's second to feel it has been a decent night's work.

Nick Montgomery will surely be angry at the simplicity of the opener. They just didn't react at the corner. The visitors had two good chances but have a long way back now.

A fairly simple goal from Abdallah Sima has Rangers one up at Tynecastle.

Hearts have been unable to take advantage of sloppy play from the away side, who have improved as the half progressed.

Image source, SNS