Ronaldo, 36, rejoined United from Juventus in August after 12 years away, while Messi has swapped boyhood club Barcelona to join Paris St Germain.
Kylian Mbappe is "relaxed" and not unsettled despite ongoing speculation about his future, Paris Saint-Germain coach Mauricio Pochettino insisted on Thursday.
Messi, who played in the South American final against Neymar and Brazil, only signed for PSG on Tuesday.
On August 4, many important events took place.
The teams first met in 1914 and in the years since have established themselves as two of the most storied sides in world soccer.
The two South American giants meet on Saturday at the Maracana stadium with Argentina’s long drought once again the major topic of conversation.
PSG lost control of the game to a transformed City side after the break, conceding two goals.
Neymar inspired Brazil to their first Olympic gold medal in football on home soil in 2016, ending a six-decade odyssey.
Mbappe has long been linked with an eventual move to Madrid, who courted him as a teenager before he signed for first club Monaco.
Mbappe scored twice to steer the visitors to a 3-2 victory over holders Bayern Munich in a topsy-turvy Champions League quarter-final first leg.
Paris St Germain forward Neymar's return from injury is on schedule after he was ruled out for four weeks earlier this month with an adductor muscle injury.
Neymar is a doubt for this weekend's trip to arch-rivals Marseille with a stomach bug, Paris Saint-Germain announced on Saturday.
An end-of-year party for 150 people attended by Brazilian soccer star Neymar is drawing scrutiny from local prosecutors.
PSG dropped down to third in Ligue 1 after Tino Kadewere earned visitors Olympique Lyonnais a 1-0 victory at the Parc des Princes on Sunday.
Neymar will start Tuesday’s crucial Champions League game against RB Leipzig after making his comeback from injury, coach Thomas Tuchel said.
Neymar will be sidelined until after the international break in mid-November following his injury against Istanbul Basaksehir in the Champions League.
Brazil had never lost a World Cup qualifier at home, a run that stood at 54 matches going into Friday’s game, and they never looked in danger of losing that record.
Angel Di Maria’s career had been in danger of fizzling out when Thomas Tuchel took over at Paris St Germain two years ago, but the German coach has found a way to get the 32-year-old to enjoy his best years last.
Paris St Germain striker Kylian Mbappe could start Tuesday’s Champions League semi-final against RB Leipzig, his coach Thomas Tuchel said on Monday.
Paris St Germain scored two late goals, including a stoppage-time winner from substitute Eric Choupo-Moting, to beat outsiders Atalanta 2-1.