However, inspired by Barcelona's remarkable comeback from a 4-0 first-leg deficit to Paris Saint-Gemrain, Guardiola - a Champions League victor as both a player and a coach at Barcelona - insisted that a remarkable comeback is possible if City are clinical on the night.
They could have won the Premier League on Saturday had they beaten local rivals and closest challengers Manchester United, but were beaten 3-2 at home despite having led 2-0 at half time.
Guardiola's current contract expires next summer but he said to be keen to stay and build on this impressive season, with City close to winning the Premier League.
"I went to congratulate him on the result", he said, offering no more insight into the exchange.
"It's no problem. I don't even think about it".
And in a recurring theme of his near two-year reign at City, Guardiola insisted his side needed to be more clinical rather than changing their style of play.
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Two goals in the space of 97 seconds early in the second half brought United level after Vincent Kompany and Ilkay Gundogan gave City a commanding 2-0 lead at the interval.
"We make a good performance in the second half".
"But a good manager (Jose Mourinho) maybe said in the first half "guys, we have to do something more".
"Of course we wanted to win today, I'm not going to deny that but we knew exactly we were going to play against, the second in the league".
And Guardiola believes City have to reach the standard set by the likes of Cristiano Ronaldo and Lionel Messi if they are to break through as a European powerhouse.
Guardiola continued to stress that you have to take your chances at this level, adding: "Football is boxes at that level". So when you have the chances you have to score two and it's possible that we could've scored three. "At that level that is the difference".