"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