The esteemed line-up includes Brazil's three-time World Cup winner Pele and legendary Argentinian Diego Maradona, who died last month of a heart-attack.
French defender Theo Hernandez's brace rescued a point at the death for AC Milan who came from two goals down to draw 2-2 against Parma in the San Siro.
"Always great to return to Spain and to Catalunya, always hard to play in Camp Nou against one of the best teams I ever faced. Today we were a team of Champions! A true, strong and united family!
Ronaldo scored one goal in the match to bring up his 70th home goal in the Champions League, a record haul he now shares with Barcelona's Lionel Messi, Goal.com reported.
"I was sidelined for a long time, despite having no symptoms and feeling fine. Today I went back to doing what I like, playing football. Cristiano is back, that's the most important thing," the club's official website quoted Ronaldo as saying.
"Ronaldo carried out a check with a diagnostic test (swab) for Covid-19. The exam provided a negative result," the Italian champions said in a statement.
Rashford's late goal earned United a 2-1 victory away to Paris Saint-Germain last week and at Old Trafford the England striker came on as a second-half substitute and scored three times
