London 2012 Olympic gold medallist Alexander Dyachenko is one of two Russians to have reportedly been banned from competition by the International Canoe Federation (ICF) for doping.
According to All-Russia Canoe Federation President Yevgeny Arkhipov, both K2 200m defending gold medal winner Dyachenko and women's K4 paddler Natalya Podolskaya have been suspended.
The duo were among five canoeists banned from competing at Rio 2016 due to being implicated in the report on Russian doping compiled by Canadian lawyer Richard McLaren.
Samples submitted by each featured in what was described as the "disappearing positive methodology" - where positive tests were switched for clean one.
Five-time world champion and Olympic bronze medallist Alexey Korovashkov, double world champion Andrey Kraitor and Elena Aniushina were also accused of the same offence.
Kraitor and Anyushin were subsequently allowed to compete following successful appeals to the Court of Arbitration for Sport.
Arkhipov has claimed, however, that Korovashkov has also not been suspended and should be free to compete next year.
"The Federation has taken a harsh stance only towards two athletes, Podolskaya and Dyachenko," he told the TASS news agency.
"As for other athletes who did not participate in the Games and were suspended, no such restrictions apply.
"For instance, Alexey Korovashkov. I do hope they will be able to compete."
insidethegames has contacted the ICF for details on the nature and length of the suspensions.
The suspensions have not yet been published by the ICF.