There's been claims of officials ignoring a similar incident involving Barca star Leo Messi against Sevilla - which has been slammed by Xavi.
"I think both actions are not comparable because you have to assess the intentions of each. Leo wants to play exclusively, while Cristiano wants to put off his opponent with a slap and keep playing. That's the difference.
"Everyone looks after their own interests and I think that Real Madrid are trying to use this move, but the image of Messi can not be damaged in any way," snapped Xavi.
"Ronaldo's actions are clear. The two-match ban is justified."