QINHUANGDAO, east China, July 30 (Xinhua) -- Chinese star striker Ma Xiaoxu may miss the Olympics as she injured left knee in an soccer warm-up against the United States here on Wednesday, local media reported.

However, the team's press officer could not be reached immediately for comments.

Ma Xiaoxu, playing as a starter in this game, was injured in the30th minute and then was taken to hospital.

The young talent, who injured her right knee in a friendly match against New Zealand last year, returned to the national team just one month ago and has been included in the Olympic squad by coach Shang Rihua.

Ma played for 15 minutes in China's warm-up game against Nigeriaon July 27, and also had ten-minute display in the tune-up against New Zealand on July 20.

The 20-year-old won both of Golden Ball and Golden Shoe at FIFA Under-20 Women's World Cup in 2006 and was the AFC Women's Player of the Year in 2006.