Great Britain captain Kate Walsh will not play against South Korea on Tuesday after having a plate fitted to her fractured jaw.
Walsh was hit with a stick during Sunday's 4-0 win over Japan and underwent surgery on Monday.
The 32-year-old may be able to play on, but no decision has yet been made on her ongoing participation in the Games.
Her place at the Games will be reviewed after she is released from hospital.
Team-mate Helen Richardson also picked up an injury during the game when she was struck in the knee by the ball.
Earlier this year, Walsh was part of the GB side beaten 1-0 by Argentina in the final of the Champions Trophy and her vast experience makes her a vital component of the team.
She has 288 caps, having made her debut in 1999, and has skippered the side for nine years.
She is a double winner of the Hockey Writers' Club UK Player of the Year award, and in 2007 was named Great Britain Hockey Athlete of the Year.
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