The 23-year-old winger was driving the sports car through a tunnel beneath the runways when he smashed into a barrier.
Greater Manchester Police (GMP) said his team-mate Edwin van der Sar was following in his Bentley, but the Dutch keeper was not involved in the crash.
Ronaldo was not injured in the accident, which happened on the A538 Altrincham Road at about 1020 GMT.
One lane of the road has been closed while the debris is removed.
'Training as normal'
A GMP spokesman said an investigation into the crash, which happened between Wilmslow and Hale, Cheshire, was under way.
Police said the Portuguese international gave a negative breath test to officers at the scene.
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