Rangers go up the other end and a cross drops to the back post, where Jayden Meghome meets it but Dave Richards produces a phenomenal save.

He was an unknown just a few weeks ago. Tonight he's been a hero for United.

Martin Dowden
BBC Sport Scotland at Celtic Park

Numeorus times now since his introduction, Dundee substitute Ashley Hay has latched onto a ball in behind and caused problems.

Celtic would do well to take heed as he looks to have the run on Liam Scales in that area.

This still isn't over.

Another huge chance for United.

A corner is headed away, and then headed back in. Luca Stephensen was lining up the bicycle kick, but team-mate Iurie Iovu steals in to head just past the post.

Emmanuel Fernandez appears to have handled the ball in the penalty area.

A long throw-in drops towards the Rangers defender and it hits his forearm, which is down by his hip.

The replays look terrible for him, but the officials are taking no action as both sides make substitutions.

Football continues to be played at the Falkirk Stadium, despite the lack of updates.

Motherwell are having the best of it going into the closing stages, Elijah Just making a big difference, although the visitors' loose passing is still giving Falkirk hope.

It does have a feel of a draw about it, though.

Jon McCracken is caught outside his box by Daizen Maeda and the Dundee keeper handles the ball after he is knocked off it.

The referee's given a free kick the other way, which is met with howls of derision from the stands.

That's how quickly the complexion of this night could change.

Marcus Dackers leaps to meet a cross and heads off the crossbar for Kilmarnock.

It's a lovely ball over the top from Dundee into the path of Ashley Hay who's thundering into the Celtic box, but there's just too much on it and he can't bring it down.

A wee reminder the visitors are still in this.

Lawrence Shankland eyes a second but drags wide of the far post from about 20 yards.

Not far away, that.

David Dickinson has made a big decision.

Djeidi Gassama goes down in the box under pressure and the referee gives... a free-kick for the home side. And he books the winger for good measure.

Big call.

Is Martin O'Neill relaxed and enjoying his last experience in the Celtic dugout?

Not a bit of it. He's as tense and focused as a long-tailed cat in a room full of rocking chairs.

Same as ever, in other words.

Image source, SNS

Brilliant work from Dundee keeper Jon McCracken, who gets down low to his left to prevent Celtic from doubling their lead.

It's after some lovely passing from the home side around the edge of the area, which culminates in Reo Hatate dropping his shoulder to get a shot away.

Good goalkeeping.

United go close and it's the man who's just on - Max Watters.

Ivan Dolcek, another sub, crosses from the right and Amar Fatah somehow keeps it in play. He knocks it back to Watters, but his stab at goal is blocked.

There's another goal in this, for sure.

Aberdeen look like they could play all night and not score.

Jesper Karlsson - just on as a sub - has a goalbound shot blocked before Adil Aouchiche spoons the rebound over the bar with the goal at his mercy.

Changes for both sides.

Yang Hyun-Jun is replaced by Sebastian Tounekti for the home side.

And it's a triple swap for Dundee as Billy Koumetio, Ashley Hay and Callum Jones come on for Simon Murray, Cameron Congreve and Yan Dhanda.