John Souttar is tackled by Tawanda Maswanhise and the ball rolls to Elijah Just, clear on goal...

But the play is called back for a foul on the Rangers defender.

Hmmmm... That looked soft. Maswanhise is livid.

Martin O'Neill turns to his bench.

Kieran Tierney and Junior Adamu are on for goalscorer Marcelo Saracchi and Tomas Cvancara.

Livi also make changes as Mo Sylla and Cristian Montano replace Cammy Kerr and Emmanuel Danso.

End to end stuff at Rugby Park.

Just after St Mirren pass up their opportunities, Kilmarnock go up the other end and a fierce shot from Findlay Curtis forces a great stop from Shamal George.

The visitors are pressing for a leveller here.

Yan Dhanda bends in a brilliant free-kick from the right and Ryan Astley's header flies just over the top.

Two good chances for St Mirren, but neither taken.

First a sustained attack ends up with Dan Nlundulu finding space in the box with the ball at his feet but he scuffs his shot and it's easily collected by Kelle Roos.

Moments later, Roland Idowu's cross-shot is inches away from Declan John connecting.

We've got a change for Motherwell, with Oscar Priestman on for Elliot Watt.

Watt has only just returned from injury, after all.

Second half under way.

Nicky Hogarth wasn't due to be playing tonight, but Falkirk's backup goalkeeper comes up with a huge stop a minute after his team take the lead.

Jon Cotterill latches on to a Luke Graham ball down the left, cuts inside and whips one towards the top corner.

A fine save at full stretch.

Bit of concern for St Mirren as goalscorer Killian Phillips goes down with nobody around him. He clutches his left ankle and it looks as if his night might be over as the physios attend to him. A minute later he's back on his feet, keen to continue.

Might be the hopes of a hat-trick that's helped with the pain/

Oh, hello.

Robbie Muirhead is wiped out by Reo Hatate.

Image source, SNS

The Celtic captain goes into the book for a cynical shoulder charge on Stevie May.

He wags his finger, but he knew what he was doing.

Liam Scales heads over the top from Sebastian Tounekti's floated cross.

Celtic's wasteful finishing has continued after the break...

The 19:45 starts resume...

Nico Raskin's sixth-minute goal splits the teams, in the only clinical moment of the first-half.

Rangers do look dangerous on the break, while possession has been dominated by Motherwell, who are playing their typically fast, one-touch football.

It's been a delight at times but they aren't carving out many clear-cut opportunities. When they have, Rangers have just about denied them - with Raskin nodding a chance off the line.

Image source, SNS

Brian McLauchlin
BBC Sport Scotland at The Falkirk Stadium

Not too much to shout about, with very few opportunities in what are dreadful conditions. Time for a pie and a Bovril...

Youssef Chermiti is down in the box, on the receiving end of a clumsy looking aerial challenge from a Motherwell defender.

It's Elliot Watt who leans into the Rangers striker. Play goes on.

Will they come back and have a look at this?

An entertaining first 45 at Rugby Park.

St Mirren had a dream start when Killian Phillips' cute backheel put the visitors in front and they were comfortable for the majority of the half but it all turned around in three minutes before the break.

Kilmarnock had shown plenty of willing in their search for an equaliser and Findlay Curtis provided the quality that delivered it. Greg Kiltie had an easy job to nod in the inviting ball that levelled the scoreline.

The hosts took the lead with a stunning finish. Tyreese John-Jules met a deflected shot with a perfectly executed volley of his own to put Killie in front. St Mirren might feel they deserved better but it sets up an exciting second half.

Image source, SNS

Derek Ferguson
Former Rangers midfielder on BBC Sportsound

A little mistake from Welsh and it presents itself for Chermiti. He's got to strike that down into the ground. You could say he's hit it maybe too well but it's straight at the keeper.

It’s a golden opportunity. You don’t get any better chance than that.