Peter Wrolich of Team Milram broke a bone in his shoulder last week in a crash in Dwars Door Vlaanderen.
The 34-year-old was involved in a crash of the peloton about 100 metres before the finish line.
An MRI test last week showed a broken bone in the shoulder, "which is naturally bad news for me," Wrolich said on his website, peterwrolich.at. However, it was a clean break which didn't require surgery.
On Monday he was to meet with this doctor to see when he might be able to rider again. "I haven't entirely written off Paris-Roubaix. But a start at the Ronde von Vlaanderen seems to be more difficult."