Chris McLaughlin
BBC Sport Scotland at Celtic Park

Hearts determined not to be overrun here but Celtic are so strong on the ball and they’re hunting in packs when possession is lost. Any glimmer of hope the visitors had from the Lafferty goal has been extinguished.

Hearts make their final change and it's Steven Naismith taking over from goal-scorer Kyle Lafferty. Will the substitute get a glimpse of goal in the final 10 minutes or so?

Here come Hearts again as David Milinkovic crosses in from the left and Kyle Lafferty heads over the top. Another goal for the visitors would certainly change the mood inside the stadium.

Kenny Crawford
BBC Sport Scotland at the Caledonian Stadium

Caley Thistle are rallying to try and find an equaliser but Iain Vigurs' shot that was deflected wide is the closest they have come so far.

Home goalkeeper Mark Ridgers has had a fine night and he's just clawed away an AJ Leitch-Smith drive that looked destined for the bottom corner.

Another Celtic change as Scott Sinclair takes over from Moussa Dembele, who has had his best outing in a Celtic shirt for quite some time.

Michael Stewart
Former Scotland midfielder on BBC Sportsound

"That is an absolutely fantastic finish, guiding it into that far corner.

"Scott Brown gives the ball away, but it's because he's always showing, he's always giving an angle and taking the ball in difficult positions.

"He tried to make the angle for Simunovic and I don't think it's a pass he should have played - the weight of it put Brown under real pressure."

Charly Musonda is involved right away, a clever back-heel setting up the overlapping Kristoffer Ajer. Moussa Dembele and Odsonne Edouard are queuing up to stick it away but Hearts somehow scramble the ball clear from the goal-line.

Image source, SNS

A huge cheer for Charly Musonda as the on-loan Chelsea man is on for his Celtic debut, taking over from James Forrest.

Odsonne Eduoard looks sure to net his second of the evening as he bustles forward with menace to meet a lovely pass from Moussa Dembele but the teenager hits his shot straight at Jon McLaughlin.

Kenny Crawford
BBC Sport Scotland at the Caledonian Stadium

We've had our first official stramash. The initial shot by Dundee's Mark O'Hara is blocked on the line and that sparks a frantic 10 seconds of pinball in the box, culminating in AJ Leitch-Smith hitting the underside of the crossbar.

Chris McLaughlin
BBC Sport Scotland at Celtic Park

Celtic have started the second half the way they finished the first - on top and in full flow. Ntcham and Edouard linking up very well. Dembele looks like he has more goals him before the lights go out here.

Kenny Crawford
BBC Sport Scotland at the Caledonian Stadium

Quite simply a wonderful finish by Scott Allan - not just curled, but perfectly passed into the far bottom corner. To score a goal of that quality in these conditions must be worthy of some kind of one-off award! AJ Leitch-Smith gets the plaudits for the set-up work.

Image source, SNS

Michael Stewart
Former Scotland midfielder on BBC Sportsound

"I’m not for a single second comparing the two, but Kris Ajer is an absolute giant, and he reminds me of Jaap Stam, his physique.

"He is a beast. As soon as the ball came into him and he knocked it past Milinkovic, he was so easily brushing him aside.

"I don’t think I actually realised how big he is. You look at his glutes and his thighs, he almost looks like he’s not filled out his upper body yet."

Image source, SNS

Kristoffer Ajer, who has been strolling through this game, is suddenly ruffled and gets booked for hacking down Arnaud Djoum near the halfway line.

Up and running again at Celtic Park. Hearts make a second change, with winger Danny Amankwaa on for central midfielder Ross Callachan.

What would you prefer?

Fraser Wallace: Hampden all day long over Murrayfield

Johnnie Notslar: Hampden has the history but Murrayfield is the better stadium.

Tom Drysdale: Neither are currently suitable as a National football stadium. A new purpose built stadium is required or at least a redeveloped Hampden.

Image source, BBC Sport

Kenny Crawford
BBC Sport Scotland at the Caledonian Stadium

The overarching half-time thought from absolutely everyone here is "please let this tie be decided by the end of the normal 90 minutes".

Conditions are atrocious and worsening...