30-year-old Chumak took his third European title, then in the 109-kilo class, in April and was a medal candidate for the Tokyo Olympics.
During a test on May 6, Chumak tried to avoid the inspectors and later try to bribe himself out of the situation, states ITA, International Testing Agency, according to AP.
The Ukrainian will now be questioned about doping offenses where he is suspected of using or attempting to use a banned substance.
His coach has also been suspended for the time being.
In addition to the three European Championship golds, which came in three different weight classes 94, 102 and 109 kg, Chumak has two World Cup medals.