Postpublished at 47mins
Rangers 0-1 Celtic
It's all Rangers in the early stages of the second half.
Plenty of huff and puff, but little in the way of composure or penetration however.
FT: Rangers 0-1 Celtic: Jota nods in free header from close range; Rangers' Tillman goes off midway through first half injured & while Celtic's Johnston goes off after break
Celtic now unbeaten in five meetings with Rangers this season
Inverness CT through to final after seeing off Falkirk in first semi-final
Clive Lindsay
Rangers 0-1 Celtic
It's all Rangers in the early stages of the second half.
Plenty of huff and puff, but little in the way of composure or penetration however.
Rangers 0-1 Celtic
Celtic get the second half under way - and they are 45 minutes or so away from setting up a domestic treble chance in the Scottish Cup final.
And halway from effectively ending their city rivals' season.
HT: Rangers 0-1 Celtic
Rangers are making a change and it looks like Fashion Sakala is replacing Ryan Kent on the wing.
HT: Rangers 0-1 Celtic
Neil McCann
Former Rangers winger on BBC Sportsound
Pull that Jota goal apart, it doesn't reflect well on any Rangers player in the surrounding area.
HT: Rangers 0-1 Celtic
Tom English
BBC Scotland's chief sports writer
There were four or five Rangers players culpable for the goal.
A defensive lapse, switching off and James Tavernier's positioning there was atrocious. He's the captain and, when the ball is in the air, he doesn't have a clue where Jota is.
HT: Rangers 0-1 Celtic
Willie Miller
Former Aberdeen defender on BBC Sportsound
It's what you come to expect now from Rangers.
You analyse the goal and think that can't possibly happen with the quality of players they've got - but it constantly does happen and that is why they're behind.
HT: Rangers 0-1 Celtic
The Celtic end was bouncing as the teams troop off for the interval.
Neither goalkeeper has had much to do in a chaotic encounter, but that dreadful lapse in the Rangers defence and quick thinking from Daizen Maeda has Ange Postecoglou's side in the driving seat.
Rangers will need to look after the ball a whole lot better if they want to get back into this game. Celtic's passing has been much sharper.
HT: Rangers 0-1 Celtic
Stand-in referee Don Robertson blows for half-time and Celtic are halfway to another win over Rangers and the cup final.
Calamity in the Ibrox side's defence presented them with the chance, but Ange Postecoglou's side were typically lethal in taking full advantage.
Rangers 0-1 Celtic
Rangers are pressing for an equaliser as we are into three minutes of first-half stoppage time.
Two punches clear from goalkeeper Joe Hart and it breaks to Borna Barisic at the back post, but the left-back slips and the chance is gone.
Rangers 0-1 Celtic
Neil McCann
Former Rangers winger on BBC Sportsound
It's a brilliant goal from Celtic's point of view. It's so bad from Rangers'. That's an absolute calamity. An absolute gift. How easy do you want to make it? Play to the whistle.
Rangers 0-1 Celtic
Pat Bonner
Former Celtic goalkeeper on BBC Sportsound
Rangers stood still and Celtic so quickly exploit them. Every Rangers defender went to sleep.
Jota all alone, he has the easiest of tasks.
Jota
Disaster in Rangers' defence!
Nicolas Raskin stands still expecting the referee to blow for a foul for his challenge on Matt O'Riley. Ryan Kent runs away, Borna Barisic stops, Daizen Maeda pounces and his cross is met at the back post by Jota as James Tavernier is caught napping too!
Great goal for Celtic, playing to the whistle, poor for Rangers.
Rangers 0-0 Celtic
It's not like Jota to mis-control.
Daizen Maeda's cross finds the Portuguese on his own at Rangers' back post, but the winger lets it run under his feet. Big chance squandered.
Rangers 0-0 Celtic
Neil McCann
Former Rangers winger on BBC Sportsound
Arfield's not getting any younger, but what he will offer is running in behind. His application is still vital for Rangers. He's an intelligent player. Fans will argue he's better coming off the bench.
Rangers 0-0 Celtic
Indeed, Malik Tillman is back on the deck and the American trudges off, face in his shirt in disappointment.
Veteran former Canada international Scott Arfield is on in his place in central midfield.
Rangers 0-0 Celtic
Willie Miller
Former Aberdeen defender on BBC Sportsound
I don't think it has been a bad half for Rangers, but they do look a bit heavy. Everything looks a bit of a struggle. They haven't been able to keep that intensity up. They're lumbering a little.
Rangers 0-0 Celtic
Neil McCann
Former Rangers winger on BBC Sportsound
I don't think Rangers look at all fresh. I think they look tired out there.
Rangers 0-0 Celtic
Rangers have a problem with Malik Tillman down after lunging into a challenge on Greg Taylor.
The on-loan Bayern Munich man was lucky not to concede a free-kick just outside the box and is also limping with a self-inflicted injury.
Rangers 0-0 Celtic
Neil McCann
Former Rangers winger on BBC Sportsound
Barisic has got a problem now because he has a booking. He's got a lot of this game left to make sure his tackling and his positioning is right.