Serie A leaders Juve staged a stunning fightback in the Spanish capital after losing the first leg 3-0, levelling the tie with two goals from Mario Mandzukic and a tap in by Blaise Matuidi.
"I don't understand why they protested the penalty", Ronaldo said. "Lucas was tackled from behind and if they don't give him the penalty, it's a goal".
Madrid have been drawn to face Bayern Munich in the semi-final, with the first leg taking place at the Allianz Arena on April 25.
It was the first time in 22 home Champions League matches that Bayern had failed to score, while Sevilla's misery was compounded in stoppage when Correa was sent off.
Very Warm Today, but Storms on Sunday
Any drives north and south on Monument Hill tonight will likely get very slick as temperatures fall on wet/icy roads. Highs on Friday will be in the upper 70s and low 80s from the Ohio Valley to Washington, D.C. and New York City.
That deficit made Wednesday's return leg seem like an impossible task for Juventus but they got off to the ideal start when Mario Mandzukic opened the scoring with a header two minutes into the match. During the game, Benatia and the rest were constantly kicking us from behind.
Real Madrid regrouped and began to get chances, but 40-year-old keeper Gianluigi Buffon stopped efforts by Isco Alarcon - twice - and Gareth Bale. "We suffered and this has to serve as a lesson for us that in football you can't take anything for granted, you have to keep fighting until the end". Cristiano played me through on the penalty spot and when I turned to shoot the centre-back came in from behind and brought me down.
"At halftime I told them things had to change and we couldn't continue like this".
The Spaniard was involved in a verbal exchange with Allegri near the final whistle after Ronaldo tucked his penalty away.
"We could've scored five or six goals, so we ought to be proud".
"I don't think that he deserves to go out in this way, but there's no going back on it now".