Quarter-final draw coming up
Defoe latches on to long ball to score, Bassey forces in second & Barisic with free-kick third
Tavernier volleys in fourth after break
Celtic suffer first domestic cup loss in 36 games at hands of Ross County
Celtic 0-1 Ross County
Celtic up the pressure as Odsonne Edouard makes a rather ambitious claim for a penalty then Mohamed Elyounoussi has an immediate chance to make an impact.
The on-loan Southampton forward rises to meet a cross eight yards from goal but can only send his header wide.
Celtic 0-1 Ross County
No surprise that there is a double change from Celtic boss Neil Lennon.
On comes Callum McGregor and on-loan Southampton winger Mohamed Elyounoussi, with striker Albian Ajeti and defender Nir Bitton going off.
Can they save the tie for Celtic?
Celtic 0-1 Ross County
Celtic are knocking the ball about in midfield, but everything is being played in front of a packed County rearguard.
There is a lack of creativity and penetration and a frustrated Kristoffer Ajer sends a low drive well wide.
Celtic 0-1 Ross County
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageIt's a dangerous game Ross County are playing now. They've dropped so deep, much deeper than I think they were in the first half
Celtic 0-1 Ross County
A stray pass in the Celtic defence hands County another sight at goal, but on-loan Rangers midfielder Stephen Kelly's long-range effort is straight at goalkeeper Vasilas Barkas.
Celtic 0-1 Ross County
Billy Dodds
Former Scotland striker on BBC Sportsound
Quote MessageThe body language again from Celtic - they look as if they're not caring. They need more from Odsonne Edouard, Albian Ajeti and Tom Rogic
Celtic 0-1 Ross County
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageThe luck is not with Celtic also. When things aren't going well for you, luck deserts you
Celtic 0-1 Ross County
It's all a bit desperate from Celtic, but Kristoffer Ajer has a chance on the turn after goalkeeper Ross Laidlaw elects to punch clear a Ryan Christie corner.
However, the centre-half's shot is blocked in front of goal.
Celtic 0-1 Ross County
Albian Ajer finds some space inside the County penalty box, but the striker can't pull the trigger.
When the ball finds its way to Diego Laxalt at the back post, the Uruguayan left-back can't match his late equaliser against Hibs last week and lashes wastefully high and wide from 15 yards.
Celtic 0-1 Ross County
Celtic started brightly, but County are quick to threaten again on the break.
The Glasgow side are almost trying too hard to do something individually and are struggling to knit it together as a team.
Celtic 0-1 Ross County
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageCeltic have got to create something in this second half. They've got to up the tempo
Image source, SNSCeltic's Christopher Jullien was left on his knees after conceding a first-half penalty
Celtic 0-1 Ross County
Celtic get the game back under way. A big 45 minutes to prevent County ending their run of 35 domestic cup tie victories in a row - and possibly save Neil Lennon's job as manager.
HT: Celtic 0-1 Ross County
Image source, SNSCeltic's Christopher Jullien pulled down Ross Stewart for the penalty that separates the teams
HT: Celtic 0-1 Ross County
Billy Dodds
Former Scotland striker on BBC Sportsound
Quote MessageSince Neil Lennon has come back, this is the biggest 45 minutes of his Celtic career for me. It looks today like they're beaten. They can turn it around, but Neil Lennon has to give them the biggest 15 minutes team talk and then ask them for the effort and mentality to probably save his job.
HT: Celtic 0-1 Ross County
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HT: Celtic 0-1 Ross County
Billy Dodds
Former Scotland striker on BBC Sportsound
Quote MessageRoss County have been excellent defensively. They've not been up the field much, but on the occasions they have, Kristoffer Ajer has been terrible. It's up to Celtic's flair players to go and break them down
Are we 45 minutes away from a defeat that will signal the end to Neil Lennon's reign as Celtic manager?
He and his side are certainly in trouble after Ross Stewart gave visitors Ross County the lead from the penalty spot.
Celtic have looked shaky all day despite having most of the possession and Christopher Jullien's clumsy challenge on Stewart threatens to send the holders out of the League Cup.
Image source, SNSRoss Stewart (left) scored his sixth goal of the season
Celtic 0-1 Ross County
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Quote MessageIt's incredible. We're only in the first half, but Christopher Jullien has gone forward as an extra striker. Wow
Image source, SNSRoss Stewart scores from the penalty spot to give Ross County the lead
Celtic 0-1 Ross County
As we enter four minutes of stoppage time, Nir Bitton sends a wayward pass out the park as another Celtic attack peters out.
Celtic 0-1 Ross County
A great chances for Celtic to reply immediately as Albian Ajeti is put clear behind the visiting defence by a clever Tom Rogic back-heel.
However, the former West Ham United striker's side-footed effort is off the inside of a post and bounces clear across the face of goal.