David Moyes was disappointed in Phil Neville's booking for a tackle on Ronaldo which saw the winger theatrically rolling around. The Everton captain won the ball but was shown the yellow card by Alan Wiley.
"There was no doubt it was a good tackle so Phil shouldn't, in any way, be getting questioned about it. I don't think you can rescind a yellow card, can you?
"But I didn't think for a minute he was going to get a card. Even if he had been a touch late, you would have to say that Vidic's tackle (on Saha) was a touch late as well," Moyes told the Liverpool Daily Post.
"I heard a right crack, I was worried (for Louis) when I saw it, I thought something had gone. Did I think Neville was going to get a red card? No, I didn't.
"I thought he might have been a touch late in getting there when I first saw it, but now I've had a chance to see it again he was spot on.
"There should be a few (of their players) going to Phil Neville saying, 'Hey, we got that wrong, good tackle lad'.
"The worst tackle in the game was no doubt Vidic on Louis Saha. We had Tim Cahill sent off in a similar area of the field (against Liverpool) and are you telling me that his warranted a red and that one warranted a yellow?"
Moyes refused to be critical of Ronaldo for his reaction.
"You're asking me to get involved in things which I really don't want to," Moyes added. "All I can say is that, at the time, I wasn't sure if Phil had been a second late, but since I've seen it, it's clear it was a terrific tackle.
"It was a spot-on tackle from an honest professional who was determined to try and get his result today and that for me was great to see.
"I like players who wear their heart on the sleeve and he certainly does for us."