Ronaldo stated this when he picked up his Marca Leyenda lifetime achievement award on Monday.
The Portugal captain is hoping to become just the second player, to win the Champions League with three different clubs.
“It is always the year of Juventus, of Madrid, of Barca,” he told Marca when asked whether the Bianconeri were among the favourites for the competition.
“In a competition such as the Champions League, only one team can win.
“I’ll use the example of Barcelona: look at how much money they have invested in the past five years in players and they have not won a Champions League. That is not how this works. Juve has brought in very good reinforcements and they are a team who are going to fight to win, as they always do.
“But it all depends upon many factors: the draw, the groups, the moments, the injuries, the luck.”