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City broke the deadlock at Old Trafford early into the second half as Phil Foden's free-kick exposed United's poor defending and Stones poked home from close range.
City, who could win the competition for a fourth successive year, will face Tottenham in the League Cup final at Wembley on 25th April.
Both Dias and Stones received praise for their respective performances as United struggled to pull themselves back into the match.
And now one fan has created a compilation to highlight why the City duo should be lauded for their individual performances at Old Trafford.
"All I see is [Paolo] Maldini and [Alessandro] Nesta," one fan said in response to the video.
While another posted: "If I was a rival fan, I would be scared. They look unbeatable."
A third Twitter user added: "Now I am confident with our defence to face against [Robert] Lewandowski, [Cristiano] Ronaldo, [Lionel] Messi or [Kylian] Mbappe."
And a fourth tweeted: "What I like the common thing in both of them is: Ability [sic] to read the possible threat, they've got Smart head on their shoulders, that's what a central defender needs."
Stones, who initially struggled at City since his £47.5m arrival from Everton in 2016, was hailed for his fine form by Guardiola after the semi-final win.
"Today, it was remarkable what we achieved, but we dedicate the victory to Colin Bell and his family and Manchester City fans that miss him a lot," the City boss said.
"We don't have as many trophies in the cabinet compared with some teams in England and Europe, but Colin Bell creates this feeling -- so it is fantastic to go day by day, against rivals United at Old Trafford, and play incredible football, win and go to Wembley again.
"John Stones came back; he made another outstanding performance. But the most important thing he has been able to do -- something he has struggled with the past three or four years -- is play four, five, six games in a row. This is so important -- for him especially, and for us.
"All the team was incredible."
Featured Image Credit: Sky Sports/PA
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