A statement said the countries risked being declared non-compliant with the agency's code.
Brazil, Greece and Indonesia are among five countries facing censure from the World Anti-Doping Agency (WADA) over flaws in their drug testing programs, the watchdog announced on Wednesday.
A statement said the three countries, along with 2015 European Games host Azerbaijan and Guatemala, risked being declared non-compliant with the agency's code when WADA's Foundation Board meets in Glasgow on November 19.
WADA said its Compliance Review Committee (CRC) set up in 2015 had reported last month that the National Anti-Doping Organizations of each country were not in compliance with the agency's rules.
The five countries have been given until November 10 to prove their compliance with WADA's anti-doping code.
If they are unable to do so, the "CRC will submit recommendations of non-compliance to the Agency?s Foundation Board," WADA said.
Brazil has faced a rocky 12 months after being placed on a WADA watchlist in November 2015.
The 2016 Olympic hosts were given the all clear in March after Brazil's then-president Dilma Rousseff signed legislation that brought the country into line with anti-doping regulations.
However, WADA hit out at Brazil in August after it emerged the country had failed to test its Olympic team in the build-up to the Rio de Janeiro Games, branding the situation "unacceptable."