"These fans have not seen the like for many, many years. These players, serial winners and serial champions."
Guardiola, who recently signed a two-year extension with City, looked disconsolate when he walked into the tunnel after the final whistle, with the United fans gleefully singing: "He's getting sacked in the morning."
Guardiola had blamed the condensed fixture schedule for the number of injuries his side has suffered this season but he made no excuses in a long and heartfelt post-game press conference.
"(We were leading) 3-0 against Feyenoord at 75 minutes and we draw that (Champions League) game. Is that the schedule, the injuries? No. We have to win that game," the Catalan said.
"Today we have to win that game because apart from Bruno Fernandes (with a late chance that the United captain put wide) nothing happened. So, we give it away again.
"If always it's the same problem, it can be fixed. You say 'Ah, it's that player.' It can be fixed: he doesn't play. But it's not that."