There was also confusion about the extent of their injuries. A friend of Tsekos said they had suffered only light injuries and had "no problem."
Later, however, following a visit to the hospital by Patrick Schamasch, the IOC's medical director, and Nikitas Kaklamanis, the Greek health minister, the hospital said the pair would be detained for 48 hours.
The hospital said Kederis had suffered "cranial trauma," whiplash and wounds to his lower leg, and that Thanou sustained abdominal bruises, injuries to her right hip and a muscular injury to her right upper leg.
The injury inflicted on Greek pride may be more serious, and the mood on the streets on Friday night indicated public opinion was turning against the athletes who were expected to be among the stars of the games.
If the panel finds Kederis and Thanou wilfully evaded the testers, they face expulsion from the Games and the sport.
Last year Kederis and Thanou missed an out-of-competition drug test after informing officials they would be training on Crete when they were in fact in Qatar.
IOC president Jacques Rogge insisted that tomorrow's hearing would not be influenced by the high profile of the athletes or their nationality.
Before attending Friday night's opening ceremony, Rogge said: "The games are much stronger than individuals."
Over the next few days he will discover if he is right.
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