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Featured Image Credit: Manchester City
Gomez, 21, completed his move from Anderlecht to City on Tuesday in a deal thought to be worth around £11m.
The Spanish defender, who played under former City captain Vincent Kompany at Anderlecht, was named as Belgium's Player of the Year last season.
He becomes City's fourth signing of the summer window, joining Erling Haaland, Kalvin Phillips and Stefan Ortega at the Etihad.
"I am incredibly proud and happy to have joined Manchester City," Gomez told Manchester City's website.
"City are the best team in England and in Pep Guardiola I have a chance to learn and develop under the most outstanding manager in world football.
"To be able to be part of this club is a dream come true for me and something any young player would aspire to."
Gomez also revealed that he grew up supporting City as a youngster thanks to his brother.
"I was a City fan when I was a kid," Gomez added, proudly showing a picture of himself in a City shirt as proof.
"When we were kids, my brother used to support City. He's the main reason I became a fan as well.
"Once he was on a school trip to London and I asked him to bring a David Silva shirt.
"At that time, he was wearing the No 21 shirt and he was my favourite player because I used to play in his position when I was a kid.
"I feel very proud that I can wear his number, like Ferran Torres did here.
Sergio Gomez: “My brother used to support #ManCity. He’s the reason I became a fan. Once he was on a school trip to London and I asked him to bring a David @21LVA shirt. He was wearing No.21 and was my favourite player - I used to play in his position as a kid..." [via @ManCity] https://t.co/TGvtQZI16D— City Xtra (@City_Xtra) August 16, 2022
"I think it's very nice that another Spanish player takes the No 21 shirt and I will give my best wearing it."
Gomez began his career as part of Barcelona's youth set-up before leaving the Catalan club to join Bundesliga side Borussia Dortmund in 2018.
The left-back then spent two seasons back in Spain on loan at Huesca, helping the club earn promotion to La Liga at the end of the 2019-20 campaign before joining Anderlecht the following summer.
He would go on to make 49 appearances for the Belgian club across the 2021-22 campaign, as they finished third in the Jupiler Pro League under Kompany.