Floyd Samba, 17-year-old son of former Premier League defender Chris, scores twice on Man City debut, Cherki adds second before Allan also scores on debut and McAidoo adds fifth
Man City will host Brighton in fourth round - see full draw here
That's all from us.
Holders Manchester City cruise through to the fourth round at the expense of Norwich City, who will turn their attention to the Championship.
A really pleasing night for Enzo Maresca, who has overseen a different kind of victory tonight with the youngsters impressing.
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So Manchester City will take on Brighton in the fourth round in the week commencing 26 October. Here's a reminder of the full EFL Cup fourth-round draw:
FT: Man City 5-0 Norwich City
Manchester City's Floyd Samba speaking to BBC Radio 5 Live:
"Right before the game yesterday, the day before - I knew there would be an opportunity to get some minutes for the first time with the first team - to get a debut like that is mind blowing. I couldn't believe it myself - but that's just the beginning, I've got a big career ahead of me. It was a great debut.
"I couldn't be happier right now, being my first senior debut, you have to expect everything to go well, the intensity, the level of players, everything goes up and you have to be able to match it and cope with it, and I think I did well with that.
"Coming from the 21's to first-team training, that's a big jump - the sessions are more tiring, you have to run more - they demand more of you and you have to cope with it.
"I spoke to all of them [the first team players], they've all been brilliant with me - before the game, giving me advice - play your game, be you - those words gave me confidence and helped me score those two goals today.
"I can't wait - recover now, rest, the team goes again - training tomorrow and then Sunderland on the weekend - everyone has to be prepared for that."
FT: Man City 5-0 Norwich City
Chris Sutton
Former Norwich striker on BBC Radio 5 Live
A brilliant moment for him. Football is a ruthless game and it's about taking your opportunities when they come along and for these young players they don't come along too often. It's good to see Cherki, O'Reilly give him that assurance, as they should.
He's arrived, he's still going to have to play the waiting game, and be patient when you play for a club like Manchester City. The demands are on winning. The fans demand trophies. His chances may be few and far between but he's done himself no harm.
FT: Man City 5-0 Norwich City
Floyd Samba didn't get his hat-trick tonight but what a performance it was from the 17-year-old on his senior debut.
Two goals and a hand in another.
Manchester City's academy continue to produce talented young players, just how far can this one go?
Samba is the son of former Blackburn defender Chris Samba and his brother, Tyrone, is also in Manchester City's academy.
Image source, Getty ImagesFT: Man City 5-0 Norwich City
Chris Sutton
Former Norwich striker on BBC Radio 5 Live
Just seeing the Norwich City staff and players go over and applaud the magnificent away support, I'm not a body language expert but it's like they rocked up, made a lot of changes, and just expected to be beaten.
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As a city fan, fabulous to see the score line, but congratulations to both managers for giving youth a chance.
Richard, Halifax
What a great team performance from the Manchester City youngsters well done.
William, Southport
A very good all round performance from the Man City youngsters. Full of confidence and ability.
Andrew, Portsmouth
FT: Man City 5-0 Norwich City
Chris Sutton
Former Norwich striker on BBC Radio 5 Live
It was too easy for Manchester City. They barely broke a sweat this evening, it was just a different class to Norwich City and Clement made a lot of changes as he's looking ahead to their game on Sunday.
Well done to the Norwich support, travelling all that way but not a lot to cheer about. Man City cruise into the next round.
Image source, Getty ImagesFT: Man City 5-0 Norwich City
Shamoon Hafez
Football reporter at Etihad Stadium
Holders Manchester City saunter through.
The stadium announcer takes particular glee in saying the side play Brighton in the next round after the Seagulls beat Manchester United on Wednesday.
Man City 5-0 Norwich City
An emphatic win for Manchester City, thanks in no small part to Floyd Samba.
The latest off the academy production line in east Manchester.
Image source, PA MediaMan City 5-0 Norwich City
Chris Sutton
Former Norwich striker on BBC Radio 5 Live
Good finish. I think it was touch and go whether O'Reilly was onside but he pulls the ball across, Lewis lets it through his legs and McAidoo comes through at the far post, left-footed and wack-a-dooed into the net.
Ryan McAidoo (90 mins)
There's number five!
Really well-worked by Manchester City. Nico O'Reilly squares across and it's a little dummy from Rico Lewis that sells the defender so Ryan McAidoo can calmly finish at the far post.
A night for the youngsters at the Etihad.
Image source, Getty ImagesUse 'Get involved' to have your say
Manchester City academy thrashing Norwich. Manchester United, are you watching?
Ken, Nigeria
Always great to see youngsters coming up from the academy.
Alan. Manchester
Don’t think Norwich will be too concerned with this result. B team out there playing, getting valuable experience. Clement is clearly focusing on the league.
Lee, Norfolk
Man City 4-0 Norwich City
Enzo Maresca has left Floyd Samba out there for the whole match so far.
He wants to see his youngster get a hat-trick.
Man City 4-0 Norwich City
A last change for Norwich as Oscar Schwartau replaces Mathias Kvistgaarden.
Man City 4-0 Norwich City
Chris Sutton
Former Norwich striker on BBC Radio 5 Live
Nico O'Reilly has strolled through this game, barely broken a sweat. A lot of the Norwich players right now will be thinking, 'I want this game to end'.
Man City 4-0 Norwich City
The corner is pawed away by Dan Grimshaw at the back post and Norwich look to get on the counter but Mo Toure's ball is massively overcooked.
Woops.
Man City 4-0 Norwich City
Ooooh, Nico O'Reilly lifts one to the back post and Ryan McAidoo was arriving but he's beaten by the defender, who chests it out of play for a corner.
Man City 4-0 Norwich City
Manchester City probing for a fifth as Kaden Braithwaite is the latest academy product to get a shot away.
Man City 4-0 Norwich City
Chris Sutton
Former Norwich striker on BBC Radio 5 Live
Norwich build well up the pitch there. I think Toure is half a yard offside but Norwich are just a different threat with him coming on.
Manchester City debutant Floyd Samba is the son of former Blackburn and QPR defender Christopher
Teenager Floyd Samba enjoyed a dream first-team debut by scoring twice to help Manchester City begin the defence of their Carabao Cup crown with a thrashing of Championship outfit Norwich City.
The son of former Premier League defender Christopher Samba, the 17-year-old scored in each half as the hosts made light work of their second-tier opposition to set up a fourth-round tie against Brighton - who knocked out Manchester United on Wednesday.
Enzo Maresca's side had initially found it difficult to make inroads on the Canaries defence, with full-back Rico Lewis drifting a rising effort narrowly over the crossbar, but they took total control by scoring two goals in three minutes.
Manchester City found the breakthrough courtesy of Samba's flicked header from fellow debutant Allan's cross, while Rayan Cherki coolly finished off when bearing down on goal from Ayyoub Bouaddi's pass.
Brazilian Allan went from provider to goalscorer at the start of the second half, showing quick feet to shift the ball on to his left boot before drilling a low finish, before Samba curled in delightfully for his second and Ryan McAidoo added a fifth late on for the home side.
Philippe Clement's men thought they had grabbed a consolation when substitute Mohamed Toure slipped home a cool finish past Geronimo Rulli, but the goal was ruled out for offside and preserved a clean sheet on the Argentine goalkeeper's debut.
A youngster to watch at each Premier League club this season
Manchester City, second in the Premier League, at home against a Norwich side 14th in the Championship never seemed like producing a shock result.
The Canaries players and supporters made the long trip over from Norfolk and return home extending their thoroughly miserable recent record against their opponents.
Norwich were heavy underdogs and it proved to be the case, having now lost their past three contests against Manchester City by an aggregate of 19-0, suffering defeat in all five League Cup meetings between the sides.
But it was a satisfying evening for boss Maresca, who made 10 changes to the side that won at rivals Manchester United on Sunday - the sole survivor from that starting XI, Cherki, scoring in the first half.
But the night belonged to academy product Samba, graduating from the club's academy into the senior set-up to score a double on his first senior start - the first an instinctive header but the second a beauty of a finish caressed into the far corner.
Maresca's side faced questions when they began the campaign with a heavy defeat by Arsenal in the Community Shield, but they have since recovered by winning six games in a row in all competitions.
They will be aiming to pick up maximum points against Sunderland on Sunday to continue a highly impressive start to Maresca's tenure, before the three-week international break.
After the opportunity to rate players has closed, the score displayed represents the average from all the submissions by BBC Sport users.
Manager: Enzo Maresca
Formation: 4 - 2 - 3 - 1
Manager: Philippe Clement
Formation: 4 - 2 - 3 - 1
Manager: Enzo Maresca
Formation: 4 - 2 - 3 - 1
Manager: Philippe Clement
Formation: 4 - 2 - 3 - 1
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