On-loan Crystal Palace winger Brandon Pierrick makes his Kilmarnock debut in one of a flurry of substitutions from both sides.

Replays suggest it might not have been a penalty, but Colin Doyle's challenge on Albian Ajeti, followed by Odsonne Edouard's spot-kick finish, has ensured this is now a procession for Celtic.

Image source, SNS

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Celtic have to hack clear nervously from a corner as Kilmarnock look for what will only be a consolation.

Game over surely.

A fine chip over the Kilmarnock defence from David Turnbull finds Odsonne Edouard.

The striker looks to be slightly offiside, but there is no flag and he knocks the ball coolly past goalkeeper Colin Doyle for his second goal of the game.

Image source, BBC Sport

Kilmarnock are so close to a goal back.

Rory McKenzie's fine dink to the back post is met by the head of Chris Burke, but the winger's powerful downward header is hacked off the line by the foot of goalkeeper Scott Bain.

Kilmarnock claim it is over the line, but replays show the officials got this one right.

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Colin Doyle goes close to redeeming the situation as he gets a fingertip to Odsonne Edouard's spot kick, but the goalkeeper is unable to prevent the French striker extending Celtic's lead.

Image source, BBC Sport

On-loan Hearts goalkeeper Colin Doyle concedes a penalty.

The Irishman looks to pull his hands away as he goes for a loose ball, but striker Albian Ajeti nips in front of him and flies through the air theatrically.

While the linesman waves his flag for a spot kick, Doyle looks on in astonishment and the decision does look harsh.

Odsonne Edouard turns the ball into the Kilmarnock net, but the flag has already gone up.

The striker had poked the ball through to Ryan Christie and the midfielder is offside as his flick goes under goalkeeper Colin Doyle, strikes the post and Edouard provides the finish.

Kilmarnock get the second under way looking to do what they have rarely done this season - coming back to win after falling behind.

Julie Fleeting
Former Scotland striker on BBC Sportsound

Pat Bonner
Former Celtic goalkeeper on BBC Sportsound

Martin Dowden
BBC Sport Scotland at BBSP Stadium

Celtic have vastly improved from recent showings and are deservedly ahead thanks to the unlikely source of the returning Scott Brown.

His header from a corner has eased the monumental pressure ever so slightly, but in the wider context it is unlikely to make too much difference.

They have looked much sharper and more purposeful, something that’s been missing too often.

One thing Kilmarnock did do on Saturday was take their chances. They didn’t make many and they’ve been limited again tonight, with the exception of Chris Burke, who might have done better.

They know Celtic’s backline has been a weak link this season. They need to generate much more in the final third to test their fragility.

Celtic are half way towards moving to within 20 points of leaders Rangers with workmanlike performance at Rugby Park.

Captain Scott Brown is the man who has made the difference, heading home from a corner against managerless Kilmarnock.

Image source, SNS

Celtic end the first half with another long-range effort from David Turnbull straight into the arms of goalkeeper Colin Doyle.

A promising position for Kilmarnock as Chris Burke cuts inside from the wing, but the former Rangers man is wild with his long-range effort.

A superb, last-ditch tackle from on-loan Bournemouth defender Zeno Ibsen Rossi takes the ball off the toes of Callum McGregor as he is found by fellow Celtic midfielder David Turnbull just inside the penalty box.

David Turnbull wins a free-kick this time and steps up and fires a drive on target, but it is easy for Kilmarnock goalkeeper Colin Doyle.

Aaron Tshibola gets his own back on Scott Brown for that earlier elbow, but the Kilmarnock midfielder is not so lucky and goes into the referee's book for his foul.