A Greek athlete has been kicked out of the Rio Olympics for failing a drugs test, the Hellenic Olympic Committee has announced.
The HOC declined to name the athlete or even say which sport they were from.
It said in a statement that the athlete concerned had returned a positive test at the beginning of July and had now left the Olympic Village.
A statement from the HOC read: "The administrative board of the Greek Olympic team in Rio announces that a first positive sample from a member of the Olympic team was found during a doping control which took place at the beginning of July in Athens.
"The HOC had requested the control of all Greek athletes who were going to participate in the Rio Olympic Games.
"The aforementioned member of the Greek Olympic team has left the Olympic Village."
Greece originally had 94 athletes across 19 sports in Rio for the Games.
The news of the failed test comes just hours before the opening ceremony to an Olympics which has so far been overshadowed by doping.
The International Olympic Committee, and in particular its president Thomas Bach, came in for fierce criticism for its decision not to impose a blanket ban on Russia following the staggering revelations of state-sponsored doping, instead leaving the decision on whether Russian athletes would compete - and which ones could do so - up to individual federations.
The IOC said on Thursday night that 271 Russians would take part in Rio.
The Court of Arbitration for Sport said on Friday night that its ad hoc division in Rio had so far registered 21 cases involving Russian athletes fighting their exclusion from the Games.