And Zidane is adamant the 32-year-old Portuguese forward's ferocious will to win is key to Real's success because he sets such high standards that his team-mates feel obliged to keep up. If he manages at least a share of the lead, he will break yet another record: the first player to finish European Cup top scorer (or equal top scorer) for five seasons running.
"Bale or Isco? I'm not going to say who's going to play".
Ronaldo netted in the Champions League final in 2008 in Manchester United's win over Chelsea in Moscow, Real Madrid's 4-1 win over Atletico Madrid in Lisbon in 2014 and opened the scoring against Juventus in this year's final in Cardiff.
"We will do everything we can to win, but I've lost many times as a player in important matches".
Take back to 1998 and it was - against all odds - Jupp Heynckes' Real side that were crowned champions of Europe, with Montenegrin striker Pedrag Mijatovic netting what proved to be the decisive goal against a Juventus side featuring Madrid's current boss Zinedine Zidane in a star-studded midfield that also included the likes of Didier Deschamps and Edgar Davids. He has something inside, which makes him a great leader.
We will have in the region of 2,000 police officer deployments across Cardiff, with every officer fully aware of the huge task ahead and committed to ensuring residents and visitors to the capital have a safe and enjoyable experience.
Elsewhere, there are no surprises in Juventus' starting lineup as the Turin giants go in search of their third Champions League crown. "I know it's possible". There are no favourites, really.
Wales worldwide Bale has declared himself fit for the showdown but he has recently recovered from a calf injury.
"I'm not going to tell you who's going to play tomorrow", Zidane said. "Juve defend very well but it's not just that, they attack also", he said.