Ronaldo netted the winner on the night, but was subdued.
He said: "I'm sorry for Manchester United but I've done my job, and I'm happy for the whole team."
He also confessed to being weighed down by the atmosphere, adding: "For the first time in my career I was beaten by the atmosphere.
"I did not feel comfortable, they were too many feelings, the kick-off ovation."
Is Ronaldo searching for excuses? Or did the United connection have a genuine effect? Give us your shout below...