Atletico had held a two-goal advantage heading into the second leg of the last-16 tie in Turin, but Ronaldo wiped out that lead within 49 minutes.
"This is why Juve brought me in, to help on magic nights like this".
"It was always going to be a special night - and it was, not only for the goals, but for the team", Ronaldo told Juve's official website. I wanted to us play like that also in the first leg, but then I changed something and it didn't go the right way.
"Atletico are a really tough team to face, but we are strong too and proved we deserved to go through", said Ronaldo.
Massimiliano Allegri's side, unbeaten in their domestic league this season, are now 18 points clear at the top of the table. "This is the mentality of champions. All the boys showed their maturity, putting in a great performance".
"They interpreted the game at their best, I have to congratulate them".
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Juventus signed 34-year-old Ronaldo last summer from Real Madrid for €100-million in order to make the difference on the continent for the Italian champions, who have not won the Champions League since 1996 and have finished runners-up twice in the past four seasons.
That same stock market had taken a hit three weeks ago, with the club's share price dropping more than 9 per cent after its 2-0 loss in Madrid.
But a Video Assistant Referee (VAR) review confirmed Ronaldo fouled goalkeeper Jan Oblak in a scramble in front of goal before defender Chiellini had finished off.
Meanwhile, Ronaldo said he also hopes to play a role in European champion's Portugal's up coming matches having not played since the beginning of the season.
Atleti did an admirable job of keeping their shape, yet the pressure continued to build and the breakthrough came in the 27th minute, when Ronaldo got his head to Federico Bernardeschi's cross and beat Oblak to cut the visitors' edge in half.
Stars like Antoine Griezmann and Diego Godin have stayed with the club despite big offers from rivals, and Diego Costa and Alvaro Morata have been added. "We struggled and they deservedly go through to the quarterfinals", said Simeone.