By SABC Sport
12th January 2023
First-half goals from Saints pair Sekou Mara and Moussa Djenepo stunned the eight-time winners on an extraordinary evening at St Marys.
Guardiola once again began with Erling Haaland and Kevin De Bruyne on the bench ahead of Saturdays Manchester derby at Old Trafford.
But, unlike on Sunday when the influential pair were not required in a thumping 4-0 FA Cup victory over Chelsea, the decision backfired as they were unable to prevent City suffering elimination after coming off the bench in the second period.
Manager Guardiola felt his Premier League champions were destined to struggle on the south coast regardless of the team he picked.
He said: Who knows whether with Kevin and Erling it would have been different? I dont know it.
We tried to do our best and we rotate the team when we played against Chelsea after the Premier League and its good.
I understand how this business works. Always we try to have everybody involved and everybody has to do it but today was not the case.
I had the feeling today it doesnt matter what line-up I am selecting, we are performing this way. Dont ask me why. This is my experience.
It doesnt matter today the line-up we choose, it would happen because we were not here. And thats why when this happen, they deserve it.
City began the match as strong favourites but failed to register an attempt on target across the 90 minutes.
Battling underdogs Southampton will face Newcastle in their first League Cup semi-final since going on to finish runners-up in 2017.
The best team won, continued Guardiola. They were better. We had a bad night and we didnt play good.
We didnt perform well and to win games - Im not talking titles - you have to deserve it.
When I win something I want to deserve it and today was not the case, thats why Southampton deserve to be in the semi-finals.
Today was not even close to what we are.
France Under-21s forward Mara swept home Lyancos cross in the 23rd minute to claim his first Southampton goal, before Djenepo swiftly doubled the advantage with a speculative effort from range which caught out City keeper Stefan Ortega.
Having begun his reign with four successive Premier League defeats, manager Nathan Jones felt the remarkable result answered some of his critics, including Havant & Waterlooville manager Paul Doswell, a Saints fan, who recently questioned his appointment.
Im really pleased with the performance, said Jones. I thought we were excellent as a team.
We were aggressive, we were organised, we went after the game, it wasnt a smash and grab
Im proud of the players and proud of the staff. Ive had people calling me out, Ive even had non-league managers calling me out saying Im not good enough.
Its a proud moment for me. To be on the same level as him (Guardiola) is wonderful, its what Ive worked very, very hard over my 33-year career to do.
Ive believed Ive earned the right to be here. Whether people think Im good enough or not doesnt really affect me because Ive been questioned at every level Ive been at and I like to respond.
Its been tough but its what youre paid for as a manager.