Timothy Weah scored on his Celtic debut as they strolled into the last 16 of the Scottish Cup at the expense of Airdrieonians.

Scott Sinclair missed a first-half penalty but made amends just five minutes later to give Celtic the lead.

He then had an easy finish after Airdrie goalkeeper David Hutton flapped at a corner to make it 2-0.

And 14 minutes after coming off the bench, Weah raced through to open his Celtic account.

The win continues manager Brendan Rodgers' unbeaten record in domestic cups with the Scottish champions, with Celtic taking another step towards an unprecedented 'treble-treble'.

Referee Andrew Dallas caused fury among the Airdrie players when he pointed to the spot after Emilio Izaguirre fell to the ground inside the box.

The Honduran defender was also surrounded by an angry visiting contingent, who felt he had taken a tumble without any contact.

But they were celebrating when goalkeeper Hutton got his right hand to Sinclair's low effort and steered it around the post.

Celtic goalkeeper Scott Brain was the hero with an astonishing five saves within 10 seconds amid a goalmouth scramble.

That was as close as Airdrie got, and Sinclair doubled Celtic's lead when Hutton failed to deal with a corner - nudging the ball into the path of the Englishman who rifled home from close range.

He could have had a hat-trick when he finished a rebound after Oliver Burke's shot was parried, but he was harshly ruled to be offside.

Nir Bitton made a lengthy return from injury for the home side - his first appearance in almost a year - before 18-year-old Weah announced his arrival with his first goal.

The on-loan PSG striker latched on to a fine Dedryck Boyata through ball and poked it first time past advancing goalkeeper Hutton.

Airdrie players were angry after Emilio Izaguirre won Celtic a penalty, but Scott Sinclair missed the spot kick
Airdrie players were angry after Emilio Izaguirre won Celtic a penalty, but Scott Sinclair missed the spot kick
'We started to find gaps' - reaction
Celtic manager Brendan Rodgers: "It took us a bit of time to get going, but after that first 15-20 minutes, we started to find the gaps.

"Scored three goals, missed a penalty, had a lot more chances and had a goal ruled out that would have given Scott a hat-trick."

'Weah can be a real asset' - analysis
Former Celtic goalkeeper Pat Bonner on Sportsound

Timothy Weah looks quick and strong. He can be a real asset for Celtic. I'm not sure Oliver Burke is an out-and-out striker, but his movement was better in the second half and he'll be happy to get 90 minutes under his belt.

Dumbarton manager Jim Duffy on Sportsound

Celtic are miles ahead of Airdrie in every department. But they kept at it and they had that one chance. If they had got that right on half time, you never know, but Celtic had more gears to go through.