Conditions are so bad that even the pre-match press conference had to be moved outdoors.
"I don't understand the question to him and I don't understand the question to myself". We were opponents for three years [in Spain] but we are professionals. "Of course, I shake his hand".
With no game taking place today, United will head back home to Manchester on Monday as planned, while City will jet off to Shenzhen on Tuesday for Thursday's game against Borussia Dortmund.
"It is the end and we can nearly go home and train in conditions where the players are safe", he said.
"Obviously I know you're [the fans] all disappointed but as players we're all very disappointed too because we've come out here to play in front of all the fans", Shaw said.
"A good result means going home without any injuries".
Asked what he wanted from the game, Guardiola said: "No injuries. That's the luck I want".
Jose Mourinho's last clash with Pep Guardiola was in the UEFA Super Cup in 2013, which Guardiola's Bayern Munich won against Mourinho's Chelsea on penalties.
"It's extremely disappointing not to be able to play the game in this fantastic stadium but the recent torrential rain would have caused problems anywhere in the world and has left the pitch unplayable", he said.
"The organizers and both clubs regret that the game could not go on as scheduled and we would like to express our honest apology for the fans who have been paying close attention on the game", the organizers said in a press release.
"It's a problem for me, bad conditions for my players to train and bad conditions for my players to play".
We may get a glimpse on Monday at some more senior players but I feel that a lot of the youth players will get some time as well.
"[Travelling to China] is good for the fans and for the commercial side of things".