Scott Sinclair comes on - accompanied by some pantomime boos from the Motherwell supporters - replacing Stuart Armstrong.

Moments later, Carl McHugh is booked for clattering Callum McGregor.

Billy Dodds
BBC Scotland summariser

"When I first looked at it, I was thinking, he must be offside, I was just waiting for the flag to go up.

"The linesman is right in line with it - there is no way out for him, he has got to put his flag up. It's just a poor, poor decision."

Willie Miller
Former Aberdeen defender on BBC Sportsound

"Aberdeen are looking much, much better, night and day from the first half, where they were all over the place.

"They're understand the shape better, moving, creating little pockets, Mackay-Steven down the left-hand side and putting some pressure on Rangers.

"But Rangers have got that two-goal lead, you would think the Dons have to get something pretty quickly to get back into the game."

Another Motherwell change: Craig Tanner coming on for Elliott Frear. The substitute almost makes an impact, seeing his header fly wide from Chris Cadden's cross.

Rangers defender Bruno Alves booked for a lunging tackle on Graeme Shinnie. "Any contact for me and he's gone," says BBC Sportsound pundit Billy Dodds.

Billy Dodds
BBC Scotland summariser

"Aberdeen aren't getting enough bodies in the box. It's maybe time for an Adam Rooney who sniffs out chances, gets himself in the box.

"They need some physicality, but also a natural goalscorer now. There are not enough Aberdeen bodies hitting the box when they do work an opportunity."

Another chance spurned for Celtic as Callum McGregor darts into the penalty area, only to see his low drive fly inches wide of the Motherwell goal.

Ryan Christie tries his luck from 20 yards, but his effort with the outside of his left foot goes straight to Wes Foderingham in the Rangers goal.

Half an hour remaining at Ibrox and Fir Park - can we expect any more fireworks?

Aberdeen's Ryan Christie joins Holt in the book for his angry reaction to the Rangers midfielder's foul on Shinnie. Shortly after, Kenny Miller slides in on Kenny McLean - again, things threatening to boil over at Ibrox.

Pat Bonner
Former Celtic goalkeeper on BBC Radio Scotland

"Motherwell are thankful to their goalkeeper tonight - Trevor Carson has made three very good saves, and that one there was magnificent, to get down so quickly to his right-hand-side."

Trevor Carson is having a fine evening in the Motherwell goal. Callum McGregor creates space for himself and drills in a low shot that looks destined for the bottom left corner, before Carson dives low to divert it wide of the post.

Rangers midfielder Jason Holt is booked for a heavy foul on Graeme Shinnie; the Aberdeen players are unhappy with that challenge. Referee Andrew Dallas produces the yellow card and restores calm.

We're still awaiting the opening goal at Fir Park. Who will provide a spark?

Image source, PA

Rangers defender Danny Wilson meets a corner at the near post and flicks the ball just wide of the upright. The hosts remain two goals to the good at Ibrox.

Billy Dodds
BBC Scotland summariser

"Set-pieces have probably been Aberdeen's best threats of the game. They've got good movement, Derek McInne sets his teams up well at set-pieces, but that one wasn't delivered into a great area."

Allan Campbell earns a booking for pulling back Stuart Armstrong. Neither side has been able to create a wee bit of magic in front of goal...yet.

Celtic on the attack in the early stages of this second half, with Kieran Tierney at the heart of it. First he finds Leigh Griffiths in the box, but the striker's shot is blocked, as is James Forrest's follow-up effort. Tierney then fires another cross right across the face of goal, but Griffiths is unable to get on the end of it.

The Steelmen have a new look for the second half: Andy Rose is on for Deimantas Petravicius.