The Manchester City manager attended the Wonderwall band's homecoming gig at Manchester's Heaton Park last month and had high praise for the Gallagher brothers, who are both diehard City fans.
Guardiola told Sky Sports: "It was really good. The first time I’ve been in this country so it was nice. Being here in Manchester, the first time.
"They came here after many, many years. They have been the best rock band in the last 50 years. And I’m happy it’s back."
Guardiola revealed that he got to meet Liam Gallagher for the first time at the gig having previously been in Noel Gallagher's company many times at City games.
The Spanish coach said: "It’s the first time I knew Liam. Noel I’ve been with many times (at City games) but Liam I never met before and I met him before the concert and he was so kind."
Guardiola stressed that the highlight was the concert itself as Oasis performed for the first time in Manchester since 2009.
He said: "I don’t know how many countries they sold out but that means how good they have been. When (people) say this team will be one of the best, I always say, ‘Ask me after 25 years.'
"Then if people still talk about that team, it was a good team. It’s like a book, if after 25 years people read the same book, that is a good book.
"It’s like Oasis, no? They come back again and sold out all around the world, it is because they are good. Otherwise, it’s not sold out."
Noel revealed earlier this week that he has been "completely blown away" by the response to Oasis' long-awaited reunion gigs.
The Don't Look Back in Anger rocker told talkSPORT: "Yeah, completely blown away. Everyone is. It’s difficult to put it into words actually.
"Every night is the crowd’s first night, do you know what I mean? So every night’s got that same energy to it. But it’s been truly amazing. I’m not usually short for words, but I can’t really articulate it."