All Confederations Cup doping tests were negative, football's governing body FIFA said Monday.
FIFA carried out unannounced controls and tested two players from each team after each of the 16 matches at the June 17-July 2 tournament in Russia.
A total of 379 tests were carried out using 854 urine, serum and blood samples for analysis at laboratories accredited to the World Anti-Doping Agency (WADA).
All in-competition tests were carried out at the WADA laboratory in Lausanne, Switzerland.
In what FIFA described as "the largest anti-doping programme ever conducted," it directly tested 239 players, 175 of them out of competition and 64 in competition.
Other tests were done by confederations and national anti-doping organizations.
British newspaper Mail on Sunday reported during the Confed Cup that FIFA was assessing whether all 23 members of Russia's squad at the 2014 World Cup were involved in a state doping programme. Five members of that group were part of the squad at the Confederations Cup.
A report commissioned by WADA and published in two parts by independent investigator Richard McLaren last year found at least 1,000 athletes were involved in a state-sponsored doping programme.
Russian organizers at the Confed Cup rejected any doping in the nation's football. FIFA president Gianni Infantino also said at a news conference in St Petersburg that all Russian players at the 2014 World Cup, Euro 2016 and European club competition were negative in tests by the WADA laboratary in Lausanne.
However, Infantino said investigations were continuing and FIFA bodies were in touch with WADA.
Test results at the Confed Cup have meanwhile been included in players' biological passports together with tests from previous FIFA competitions and international events including the Champions League.
"The Athlete Passport Management Unit (APMU) has reviewed the data of all participating players and did not detect any deviations that may indicate an abuse of performance-enhancing drugs," FIFA said.
By Barry Whelan
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