The South American is confident he can prove his critics wrong once he is able to improve his English, which has seemingly seen him struggle to communicate with the City backline at various times this season.
Leroy Sane and Sergio Aguero then made sure of the points as City moved into third in the table, leaving Guardiola to laud his skipper.
Unlike City, Southampton must play five of the current top six teams, meaning points may be hard to come by in the next few weeks.
"They have very good midfielders, all the strikers are so fast, they play the wingers inside".
Pep Guardiola admits Manchester City lack the "mentality" to compete with Europe's elite and plans to address the problem in this summer's transfer market.
Pep Guardiola will also be unable to call upon Gabriel Jesus and Bacary Sagna due to injuries.
Southampton find themselves four points out of 8 place with two games in-hand of West Brom.
"We had that in the Monaco game and we can not forget how good they are after what they did in Dortmund".
Sergio Aguero has 28 goals this season - the fifth time in six campaigns at the Etihad that he has reached that mark.
"Not just the defensive part - he's helped us a lot - but he is doing all he can do in our process to create chances".
"Hopefully that experience will help us for next season".
City, perhaps inspired by Bravo's heroics, promptly wrapped up the win with two goals in three minutes.
Guardiola seemed to disregard the fact his predecessor Manuel Pellegrini led Man City to the semi-finals, and a narrow loss to Real Madrid, less than 12 months ago.
"For me it's always a long journey back", he told BT Sport.
"The performance is so good considering where we are playing and that is why we are so, so happy".
"He's trying and that is what I want".
"Of course we follow all the players who are playing on loan this season, and of course, Joe, we will follow Joe every weekend".
The Champions League quarter-finals began this week without City's involvement.
"After that, if he misses chances or misses other things, always you can improve but I have no complaints".