The City trio were filmed outside a bar in Manchester on Sunday night, with claims on social media suggesting Grealish was turned away for being inebriated.
City believe this to be false, according to the Manchester Evening News, with the club apparently indicating the players left the bar in question after a misunderstanding with staff.
Guess no one will say anything because it’s not Pogba. pic.twitter.com/8OOxQKvhQL— ًEllis. (@EIIisV3) February 7, 2022
Last month, Grealish and Phil Foden were warned about their conduct and dropped after a night out, The Times said at the time.
But Guardiola seemingly has no issue with Grealish, Walker and Mahrez this time, adamant all were "perfect" and none of them were drunk.
Speaking ahead of Wednesday's (AEDT) Premier League meeting with Brentford, Guardiola said: "I'm so upset because they didn't invite me, and I don't like it.
"Next time, I hope they can invite me and have dinner correctly at eight o'clock.
"The video didn't show what did or didn't happen. Dinner together, sober, enjoying with mates and some of the backroom staff. So, the players know, they risk when they go out because of social media.
"All of them, they were perfect [not drunk], but they will be fined because they didn't invite me," he said with a grin.
Then asked if they had been unfairly treated, Guardiola replied: "In this case, yes."
Attention soon turned to talk of Guardiola's future, with the City boss into the final 18 months of his contract.
He appeared completely at peace with the situation, convinced that him staying longer is simply down to the results he gets.
"I'm here six years because we won a lot," he said. "I came because many people convinced me.
"It [staying beyond next year] depends on the results, nothing more than that.
"I have one and a half years left on my contract, which is a long time when you look around at world football."