Traces of steroids were found in the urine of All Blacks great Dan Carter after guiding his French side Racing Metro to the Top 14 title, a French newspaper claims.
L'Equipe claims Carter, fellow former All Black Joe Rokocoko and Argentina's Juan Imhoff all had abnormalities in their urine after tests conducted by the French drug-testing agency following the final in Barcelona on June 25.
The newspaper says according to its information the trio did not have a therapeutic use exemption for the banned substance.
Carter, 34, helped Racing Metro to their first French Top 14 title in 26 years by kicking 15 points to defeat Toulon 29-21 while wing Rokocoko scored a superb try.
Carter joined the French club after being named man of the match as the All Blacks won the Rugby World Cup last October after beating Australia 34-17 in the final.
He is the leading Test points scorer, amassing 1598 points in his 13-year All Blacks career over 112 Tests.
Rokocoko, 33, joined Racing Metro last year from Bayonne who he joined after playing 68 Tests for the All Blacks, scoring 46 tries.