"The first 75 minutes in the last game, I'd like to play the same, top for 75 minutes, but United showed us last season they need 10, 15, 20 minutes to create a lot of chances", Guardiola said.
Earlier on Friday Mourinho vowed to go toe-to-toe in Sunday's derby with a Manchester City side that he claims are "untouchable" in terms of the quality of their football and the squad they have built.
Since the beginning of February 2018, United have come from behind to beat Chelsea, Crystal Palace, Manchester City, Newcastle United, and Bournemouth in the Premier League. "It's true they are the favourites because they are in unbelievable form but this is Manchester United and you never know what can happen".
"If we draw [the gap] is nine points if we lose it is 12", he said.
Jo Johnson quits and calls for a second referendum
She has lost all authority and is incapable of negotiating a Brexit deal within her own party, let alone with the EU. The only alternative on the table, he said, is a no-deal Brexit that would "inflict untold damage" on Britain.
"It's true that recent results gave us good spirit, energy, but the real Manchester United. we will see at the end of the season if we can say that we had a good season". I think that is untouchable but what is behind [the scenes] I can not say. "I don't think it's easy for him".
It left Mourinho's side just two points behind leaders Juventus with two matches to play in Group H.
"They are a very good team with very good players, so you have to be on your toes all the time and can't relax for a second".
Romelu Lukaku will also face a late fitness test having missed United's last two outings with a hamstring injury, with Mourinho hopeful he could be fit to play.
It also said the player does not get on with his team-mates and finally that he does not like Mourinho's management style. "If his response is positive - and we have of course one more session tomorrow - he is ready".