British halfpipe skier Rowan Cheshire was knocked unconscious in a training accident at the Rosa Khutor Extreme Park on Sunday night, the Olympic News Service reported.
Cheshire, 18, fell heavily on her face and, after remaining unconscious for several minutes, she was taken on a stretcher to a nearby medical tent, the report said.
A Team GB spokesman said: "Team GB halfpipe skier Rowan Cheshire was injured this evening during halfpipe training.
"She was immediately taken from the course and is currently at the polyclinic in the Mountain Village, where she is being evaluated by Team GB medical personnel."
Cheshire was scheduled to compete on Thursday and is considered a medal prospect after winning her first World Cup title in Calgary last month.
Cheshire's injury came at the end of a day in which crashes littered the women's snowboard cross competition, with Norway's Helene Olafsen and American Jacqueline Hernandez stretchered off the course after accidents in qualification.
Swiss aerials skier Christopher Lambert was taken to hospital after suffering a suspected dislocated elbow in a heavy fall during training.
On Saturday, Russian ski cross athlete Maria Komissarova sustained a broken and dislocated spine after a training accident. She underwent a six-and-a-half hour operation at a hospital in nearby Krasnaya Polyana.