Aigle - Russian cyclist Eduard Vorganov was provisionally suspended on Friday following a positive doping test.
The International Cycling Union said the Katusha rider tested positive for meldonium in an out-of-competition control on January 14.
The UCI said Vorganov has requested that his back-up "B'' sample be tested. He remains suspended pending a ruling in the case.
The UCI said it's the second failed test for a Katusha rider in a 12-month period after Luca Paolini tested positive for cocaine in July. A disciplinary panel will rule in the coming days on possible sanctions against the team.
Meldonium was added to the World Anti-Doping Agency's list of banned substances on January 1.
Katusha issued a statement saying the substance "has never been used by the team in any form and was not provided to the rider by the team." It suggested that Vorganov used the substance "on his own initiative."
Katusha said it has suspended Vorganov from all team activities.
"Team Katusha will conduct an investigation as such conduct is in breach of the team's strict medical and anti-doping internal rules," the team statement said.