Ronaldo scored Real Madrid's first half equaliser after Danny Welbeck had put the visitors ahead in the first leg of the Champions League last-16 tie at the Bernabeu.
Such is Ronaldo's affection for his old club, Sir Alex Ferguson revealed the Portuguese winger came into the dressing room to catch up with his old pals after the match.
"I spoke to him. He is sitting in our dressing room, talking to the lads," said the United boss.
"He had six years with us and I am proud of how he flourished."