Ronaldo netted in the 10th minute at the Bernabeu to give Real Madrid the lead against their city rivals.
The Portuguese star was standing in an offside position when Sergio Ramos sent in a cross from the right wing.
The officials didn’t adjudge Ronaldo to be interfering with play but within seconds he had bundled the ball into the net.
BT SPORT
Steve McManaman says Cristiano Ronaldo's goal for Real Madrid shouldn't have counted
I think when the cross comes in the linesman should put his flag up, I really do
Steve McManaman on Cristiano Ronaldo's goal for Real Madrid v Atletico
And former Liverpool star McManaman says Atletico should feel hard done by.
“I think he was offside,” he said on BT Sport.
“I think when the cross comes in the linesman should put his flag up, I really do.
BT SPORT
Steve McManaman says Cristiano Ronaldo's goal against Atletico was offside
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“I know he’s not interfering with Savic who clears it, but he’s there and the fact that he scores a second later.
“He’s in the right place at the right time all the time isn’t he. His movement is great all the time, he’s on his toes trying to distract the central defenders, trying to move them out of position.
“There’s no fluke that once it’s come back into the box Ronny is there to stick it into the back of the net again.”