That's a cracking chance for United as Emmanuel Adegboyega tees up Sam Dalby in the Celtic box but he can't manage to get a shot off.

Up the other end, Reo Hatate lashes a shot over the bar.

Oh my word. Stephen O'Donnell should win it for Motherwell.

Tony Watt slips him in behind and it falls on his left foot, but he steers the ball just wide of the left-hand post.

He was under a bit of pressure from a defender, but it's a golden opportunity nonetheless.

Kilmarnock now go close. A ball from the right is headed by defender Dan Casey to the back post, where Bruce Anderson lets it bounce before shooting.

But it ripples the side-netting.

Allan Preston
Former Dundee Utd defender on BBC Sportsound

Dundee United can be very happy with the way they've played, but Celtic's class has shone through again.

A great chance for Motherwell.

Kai Andrews robs a Kilmarnock player and then gets moving into the box, the ball breaks for Tony Watt but he scuffs his shot miles wide.

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

That second goal is crucial for Celtic.

Sam Dalby sticks a leg out as the ball falls favourably to him in the Celtic box, but he's inches away and the hosts regain possession.

Miller Thomson is on for Jort van der Sande as Jim Goodwin makes a fourth change.

Paulo Bernardo is coming on for Celtic too, Arne Engels is the player to make way.

Both managers are starting to empty their benches.

Kilmarnock call for Danny Armstrong and Bruce Anderson. Stephen O'Donnell, Moses Ebiye and new signing Kai Andrews are already on for Motherwell.

Allan Preston
Former Dundee Utd defender on BBC Sportsound

I think bringing Ross Docherty on has been a masterstroke.

He does the brilliant thing - he actually passes to his own men!

Image source, SNS

Martin Dowden
BBC Sport Scotland at Celtic Park

At half-time, few people saw this coming.

Jim Goodwin's side are really getting a grip of this and you feel an air of nervousness around the stadium.

Confidence is high right now and they deserve enormous credit.

Goalkeeper Aston Oxborough rescues Motherwell again. Bobby Wales drives into the area and finds Marley Watkins at the back post.

He spins and gets a shot away, but Oxborough came charging out to close the angle and block the ball with his body.

Luke McCowan makes way for Luis Palma as Celtic prepare to defend a United free-kick.

Allan Preston
Former Dundee Utd defender on BBC Sportsound

You've got to applaud Jim Goodwin, the way he's set his team up.

In this second half Dundee United are very much in this game.

And United almost have another shot as Emmanuel Adegboyega's cross just misses the feet of Jort van der Sande.

The away side are starting to stretch Celtic.

Kilmarnock are still the better team, but they've definitely dropped the intensity.

Has the host of missed chances got to them? Can Motherwell take advantage?

Glenn Middleton has the first real chance for Dundee United, smacking the shot towards the near post and Kasper Schmeichel forces it behind for a corner.

Reo Hatate launches an effort from about 20 yards out, but it's comfortable from Jack Walton in the United goal.

Andy Burke
BBC Sport Scotland at Rugby Park

Was chatting to a member of the Rugby Park staff over a Killie pie at half-time.

"This has got 1-0 Motherwell written all over it," he said.

The longer this goes without Killie finding that opener....

Image source, SNS