The Portugal international remains unperturbed by the Blancos' loss at the Signal Iduna Park, and is still confident they will reach the next round.
Madrid currently sits second in its section with six points from three games following Wednesday's defeat, and has a three-point lead over third-placed Ajax.
"There is no great drama because there are lot of matches left and we are still well positioned to progress," Cristiano Ronaldo stated to the official Madrid website. "We knew that it would be a difficult match against a good team that are very strong at home. That's football and the chances of winning are the same for each side when you play against a great team.
"The team did well, but Dortmund's second goal was a little bit lucky.
"We realize that away from home it is becoming increasingly difficult to get anything from matches. We knew it would be difficult because we were playing a great opponent."
Real Madrid will be looking to return to winning ways at the weekend when it takes on Mallorca.
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