Lyudmila Blonska of Ukraine is under investigation for a positive doping test and could be stripped of her silver medal in the Olympic heptathlon, according to AP.

The International Olympic Committee says it has opened a disciplinary procedure into Blonska, who finished second behind fellow Ukrainian Nataliia Dobrynska last Saturday.

The IOC disciplinary commission and executive board are expected to rule on the case Thursday.

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If found guilty of a doping offense, she would lose her medal and be expelled from the games.

The third-place finisher in the heptathlon was American Hyleas Fountain, while Russia`s Tatiana Chernova was fourth.

Four athletes have been disqualified and kicked out of the games so far for positive drug tests.

Blonska served a doping suspension between 2003-05. If found guilty of a second offense, she could face a lifetime ban.

AP