The Olympic gold medallist hit a pole at the North American leg of the World Cup last month but thought nothing of it.
However, the pain and swelling persisted and the German ace decided to undergo scans, which subsequently confirmed a broken left thumb.
Hoefl-Riesch, who lies second in the overall standings behind Tina Maze, announced the news on her Facebook page, adding that the blow is unlikely to keep her out of action at this weekend's event in Val d'Isere.
