FIFA says its disciplinary panel extended bans to apply worldwide in doping cases for six players in Africa, Asia and Europe.
All the cases were previous judged at confederation or national level bodies, which imposed bans of between six months and four years.
The highest-profile player was Congo international Christian Ngudikama, who tested positive for ephedrine at the African Nations Championship in January. The Confederation of African Football banned Ngudikama for two years through March 30, 2018.
The other cases, including those relating to futsal and second-tier leagues, involved players from Algeria, Belarus, Malta, Saudi Arabia and South Africa.