The Belgian star cyclist was injured during training on Tuesday and suffered fractures in the ribs, shoulder blade, and right hand, writes his professional team Soudal Quick-Step in a press release.
His injuries will be further examined before a rehabilitation schedule is established.
Belgian media reported that the 24-year-old did not have time to react when the door of a mail truck suddenly opened in front of him.
In pictures, Evenepoel can be seen holding his arm as he sits next to an ambulance and has a blanket wrapped around him.
Remco Evenepoel became the first cyclist in Paris to win both the time trial and road race at an Olympic Games. The Belgian has also won two World Championship gold medals.
