Bak crashed towards the end of the race, and subsequent scans revealed a fracture in the scaphoid, one of the eight carpal bones that is often injured when landing on an outstretched hand. His surgery will take place on Tuesday.
The team have brought in Jonas Van Genechten to replace Bak in the upcoming Etoile de Bessèges, which starts on Wednesday.
The 32-year-old Bak will escape having his arm in plaster, but will instead require a screw to be inserted into his wrist which should ensure a relatively speedy recovery.
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