After being labelled derisively as the 'old and fat one' by the Manchester United manager, the Brazil legend has classed the comments as an unprofessional blunder by Ferguson.
The Scot described Ronaldo as the "old and fat one" when asked to compare the 36-year-old to his namesake Cristiano ahead of the Spanish giants' visit to Old Trafford on Tuesday. When asked about Ferguson's disparaging remarks during a FIFA visit to Arena Pernambuco, one of the venues for the 2014 World Cup, Ronaldo remained diplomatic.
"I respect his opinions, I'm not pretentious as to expect that everyone will think I'm the best," Ronaldo told reporters. "I'm happy for what I achieved in football and for having been chosen as the best in the world.
"I feel sorry for the disrespectful manner in which he referred to me, it's something that's not good for someone of his position."
Ronaldo was widely revered for his impact on the footballing world, with the Brazilian scoring more than 400 goals during a glittered career that saw him win the World Cup twice and earn the accolade of FIFA World Player of the Year on three separate occasions.
Recently, the striker’s legacy has been sullied by his well-documented weight issues, forcing the former Real Madrid star to turn to reality TV to lose almost 40 pounds throughout the course of the Brazilian show - a staggering feat that he jokingly claimed Ferguson was unaware of.
"About my former figure, I have nothing add." Ronaldo said. "He clearly hasn't seen me since 'Medida Certa' [the show]."