| Last updated
The Jamaican ran the 100m in a world-record 9.58 seconds at the World Athletics Championships in Berlin in 2009 but hasn't been as dedicated in his training since his retirement from athletics in 2017.
Five-time Ballon d'Or winner Ronaldo sprinted 92 metres inside 10 seconds at 33.12km/h for Juventus against Napoli in September 2019, while he also recorded the fastest top speed at the 2018 World Cup ahead of 35 players at the tournament.
And Bolt, who unsuccessfully attempted to cross over into professional football, reckons "super athlete" Ronaldo, still going strong at 35, is faster than him nowadays.
"For sure Cristiano [is faster than me]," Bolt told Marca Sport Weekend.
"For me he works out every day, he is a super athlete.
"He always on top of his game, he works hard and he is focused. Right now I definitely think he would be faster than me."
Ronaldo explodes out of the traps in quite sublime fashion and has a stride that resembles that of a professional sprinter.
During his time at Real Madrid, a 26-year-old Ronaldo went up against Angel David Rodriguez, captain of the Spanish athletics team, in a 25 metre dash.
As per AS, he revealed that he was three tenths of a second ahead of the Portuguese superstar.
"I took three tenths from him [Ronaldo], which is quite a lot. If it was 100 metres, he may be able to get 11.60 [seconds]."
That means he would be approximately just over two seconds off Bolt's record-setting time of 9.58 seconds.
Ronaldo managed to defeat him in a diagonal race, with his skill set much better equipped for this sort of challenge than Rodriguez's.
"This was the trap they set for me, to start running diagonally. It's like making a sprinter play paddle tennis," he explained.
When asked by FIFA.com which players he would have with him in a 4x100m relay race, world's fastest man Bolt picked Ronaldo, Gareth Bale and Kylian Mbappe.
Chosen for YouChosen for You
Most Read StoriesMost Read