Ever since they collided in a heated Barcelona vs Inter Milan Champions League semi-final back in 2010, there has always been a rivalry between Pep Guardiola and Jose Mourinho.
The two master tacticians are the polar opposite as managers, with the former focused on an aesthetically-pleasing philosophy, while the other is the king of pragmatic management.
That's not to say Mourinho can't turn on the attacking flair but if you need three points at a difficult away ground, the Portuguese boss is the best in the business at the top level.
Now, the two enigmatic managers are back in the same division, in charge of the two Manchester giants.
Last season, Guardiola emerged victorious in the Premier League, winning 2-1 at Old Trafford but was held by Mourinho's men to a 0-0 draw at the Etihad.
This campaign, the world will be watching perhaps the biggest Manchester derby in the fixture's history.
However, the game is not scheduled until December 9, so football lovers will have to wait for the feast of football.
But, that does not mean the two coaches will not be sniping at each other like always and Guardiola has already taken a thinly-veiled dig at his arch nemesis.
Speaking on the BBC with Gary Lineker, the Spaniard was questioned about the direct style of play in England and his reply was just fantastic.
He said, per Mirror: "I don’t think so.
"You see for example you see the national team, Dier, Dele Alli, Marcus Rashford, John Stones, Kyle Walker, Henderson, Lallana - these are players who have the quality to play.
"I see Chelsea, I see Tottenham, they want to play, they like to play, and build up, so when United play long balls, second balls they play to Fellaini and Pogba after they have the quality to play."
Cue a United fan meltdown on Twitter, with some doing their research to prove Guardiola wrong.
UNITED FANS TWEET
They're not happy and to be fair, you can understand why. This season, United have been one of the most entertaining teams in Europe, with the likes of Romelu Lukaku and Marcus Rashford turning in some stunning attacking displays.
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