Russia's World Cup team was told to stay away from "exotic teas" and foreign medicine to avoid testing positive for doping during this year's final.
The Russian Football Union issued the recommendations in a series of tweets that also included instructions to be careful with meat from Latin America and China.
"We are proud that Russian football players did not test positive once in the past four years," the RFU said.
"It is very important to stay completely clean."
"But the most important thing for me now is preparations for the World Cup and of the Russian team for the tournament."
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