Ronaldo revealed last Sunday that he was "sad" at the Santiago Bernabeu, but as yet nobody has been able to work out why.
But Portugal team-mate Nani stated on Friday that "Ronaldo isn't sad, he's fine", and Benzema seems to subscribe to the same school of thought.
"I don’t know why Ronaldo is sulking. I haven't really followed the story but I haven't seen him unhappy," the former Lyon man said at a press conference on Sunday morning.
There has been much speculation about whether Ronaldo is keen on a move away from the Spanish capital, or whether he is simply after a higher salary, following his declarations that his issue is a "professional" one.
Benzema's seemingly unsympathetic attitude is not uncommon among people in the game, given that former Barcelona coach Carles Rexach had recently stated: "He's a top player, he has everything. He is physically fit, well built, has money, success, is one of the best players in the world. I don't know what else he wants, so for him to be sad is sacrilege."
Ronaldo scored in Portugal's 2-1 win over Luxembourg in the 2014 World Cup qualifiers on Friday.