Football fans are going insane after the Champions League draw for the quarter-finals has apparently "leaked" online.
United finished as runners up in the Premier League in 2017-2018, 19 points behind champions City.
The other clubs to have booked their spots are European giants Juventus and Barcelona, and surprise packages Porto and Ajax - the latter of whom dethroned Real Madrid last week.
The two teams have faced each other 11 times in the past, with Barcelona winning four times, United three times and four games ending up in a draw.
UEFA said that the same rule would apply should both teams advance to the semi-finals.
Juventus' courageous turnaround to send Atlético de Madrid crashing out of the competition impressed the blaugranas, which is why they would prefer not to meet them - at least at this stage.
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"I think if the draw gives something like Manchester City versus Manchester United, or Tottenham against Liverpool, for example, I think would be absolutely fantastic matches".
The two Manchester clubs were also hit by the regulation in 2011-12, when both were drawn at home in the second leg of their round-of-32 Europa League ties.
Tottenham were the first of the English teams to book their spot in the last-8 this season after they brushed aside a muted Borussia Dortmund.
"There are worse teams that have done well and got to finals".
"I wouldn't like Juventus against Barcelona, it would be something really special in a possible final or semi-final".
Messi, whose brilliance was key to Guardiola's two Champions League triumphs with Barcelona, is just as unsafe as Ronaldo and it will be intriguing to see whether any of England's four clubs can find a way to overcome the game's two modern greats.