A lull in the play allows Rangers to introduce 20-year-old midfielder Charlie McCann and they are back to their full strength.

Meanwhile, Aberdeen bring on forward Marley Watkins in place of midfielder Graeme Shinnie.

It's 10 men against 10 with Charlie McCann preparing to come on with Kemar Roofe unable to carry on for Rangers.

Kemar Roofe is clear behind the Aberdeen defence.

But he is stopped in his tracks by Liam Scales on the edge of the penalty box.

The Rangers scorer is down and heads off holding an injured elbow.

Aberdeen win a corner as they dig deep into their reserves of energy.

But Rangers manage to clear the danger. You imagine the Pittodrie side won't have too many more chances, but you never know.

Tom English
BBC Scotland's chief sports writer

Wright did brilliantly, real intent and put a nice ball into Roofe. Roofe is a good finished, a better finisher than Morelos. His last goal was April 2021. That was an extra time winner against Braga. Has he got another today? He's had a horrible run of injuries, but he's a classy player and he might be the difference.

The Aberdeen players must be exhausted, they've emptied themselves. They've been let down by their captain and it opened the door for Rangers who walked right through it.

Neil McCann
Former Rangers winger on BBC Sportsound

Rangers have found a bit of character under Michael Beale. Some steel, some determination in games when they've not been playing at their best. They've not been at their best again today, but the decision of Stewart has helped them massively.

Beale has found something and it's important to have in a team, the determination not to give up when things aren't going for you.

Scott Wright is so close to a third for Rangers.

The former Aberdeen winger unleashes a 20-yard drive justside.

A refreshed Rangers face a depleted Aberdeen as the Ibrox side look to defend their lead in the second period of extra time.

Fashion Sakala and Borna Barisic are the men coming off for Scott Arfield and Adam Devine.

Rangers are preparing midfielder Scott Arfield and full-back Adam Devine to freshen up their side.

Rangers are 15 minutes away from an Old Firm League Cup final.

Aberdeen are down to 10 men after the sending off for captain Anthony Stewart just before we entered extra time.

Rangers have got a firm grip of possession and Aberdeen's 10 men are pinned back.

Jim Goodwin's side have to find a way to reverse the flow or they are exiting the League Cup.

Aberdeen have Jonny Hayes and Ylber Ramadani hobbling as Rangers forward Fashion Sakala stabs a shot just wide via a deflection.

Meanwhile, VAR is back in operation.

By the way, the game is continuing without VAR in operation as the system has broken down.

Hopefully nothing crucial is missed in the final minutes!

So close to an equaliser for Aberdeen's 10 men - and from a former Celtic man.

Substitute Jonny Hayes lets fly from 20 yards, but goalkeeper Allan McGregor does well to save at the second attempt.

Willie Miller
Former Aberdeen defender on BBC Sportsound

It's a great substitution, isn't it? Wright just burns past Matty Kennedy, who has had a long hard game but he has to defend that better. When it comes in, McCrorie and Scales have to defend it better, too.

Neil McCann
Former Rangers winger on BBC Sportsound

There's a substitution with impact. Beale has thrown Wright out there to be aggressive in the wide area. He knows he's against Matty Kennedy, who's not a full-back and is tired, fatigued and put a lot into the game. Wright has absolutely roasted him.

Is he good enough to pick out Roofe? Yes he is. It's a beautiful wee finish, it's all about making good contact.

There's another delay as the referee heads over to the VAR terminal.

It seems to be a communication problem rather than any problem with the Rangers goal.