Italian cyclist Marco Coledan has been ruled out of the under-23 men's time trial at the world road championships after skidding in training and falling under a truck.

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Coledan, who was trying out the route ahead of the first race of the championships in the Italian town of Varese, suffered a knee injury and may require surgery.

"I'm sorry for the lad because has been preparing for this race since July," Italy coach Rosario Fina said.

Fellow Italian Adriano Malori is among the favourites for the race and goes out last.

The annual championships end with the men's road race on Sunday.