The South African hooker Chiliboy Ralepelle has been suspended for two years by World Rugby, after he failed a doping test while recovering from injury in February of last year.
Ralepelle, who plays for Toulouse in the French Top 14 competition, has previously tested positive for a banned substance, methylhexanamine, in 2010, although he was not banned on that occasion.
In a statement on World Rugby’s “Keep Rugby Clean” website, World Rugby chief executive Brett Gosper said: “World Rugby operates a zero-tolerance policy on doping and players are responsible for any prohibited substance found in their body.