Ronaldo then stepped up and duly slotted the penalty past substitute goalkeeper Wojciech Szczesny with his team moving into the semi-finals 4-3 on aggregate. You need to fight to the end.
Gianluigi Buffon was infuriated by referee Michael Oliver's decision to award Madrid a penalty in the 93rd minute and was sent off for his aggressive reaction but Marcelo insisted there was no doubt over the spot-kick.
The confrontationsaw Chiellini claiming that Madrid's players had bought the referee (as he already had said on the pitch) and other members of the team confronting the match officials and members of the Spanish side.
Juventus looked to have staged a stunning revival at the Santiago Bernabeu to force extra time after Mario Mandzukic scored twice in the first half and Blaise Matuidi added a third on the hour mark after a goalkeeping clanger from Real's Keylor Navas.More news: Prominent US lawyer dies after setting himself on fire in protest
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Isco had a goal correctly disallowed for offside soon after as Real pushed for a killer fourth goal in the tie, with Buffon blocking well at his near post from Isco soon before Juventus' second.
Ronaldo has scored 21 goals in his last 11 matches in all competitions, and has netted in 11 straight Champions League matches.
"My pulse was racing but I stayed calm, I knew it was decisive", said Ronaldo. Despite this, the 33-year-old got his opportunity to make the difference right at the end, after calmly slotting in the match-winning penalty in the 97th minute.
Real Madrid on course for another European crown: Los Blancos made history during the previous campaign as they became the first club to win consecutive Champions League titles in the modern era.