Fall rules Worley out of Winter Olympics
France's Tessa Worley crashes into the advertisement banners as she falls after missing a door in the FIS Women's World Cup Slalom on December 17, 2013, in Courchevel, in the French Alps
The 24-year-old suffered a ruptured anterior cruciate ligament in her right knee, French Ski Federation (FFS) national technical director Fabien Saguez said.
"She won't comment this evening, but tomorrow (Wednesday), after meeting in Lyon with the surgeon who will carry out the operation. There is also a small outer meniscus wound.
"It's a tough blow for skiing. We've gone from light to darkness overnight," added Saguez.
Her injury is another blow for the French women's skiing team after world downhill champion Marion Rolland was ruled out of the Sochi Games after injuring her right knee training in Chile in September.
Laurie Mougel, France's top slalom racer in 2012-2013, has also been ruled out for this season.
Worley got into trouble at the top of the slope during the first run and crashed into an advertising billboard.
In tears as she was brought down from the summit of the piste by luge she was taken to hospital in Lyon for tests which later confirmed the cruciate ligament damage.
Worley, whose father is Australian and who grew up skiing in France and New Zealand, won the women's World Cup giant slalom at St-Moritz on Sunday for her eighth career victory.
It was a first win for a French skier this season and came as something of a surprise as she had been struggling for form.
It was her first World Cup win since the giant slalom at Soldeu in Andorra in February 2012, although she did win the world title this year.