Yahoo! Sports’ Adrian Wojnarowski reported the news and says Calathes tested positive for Tamoxifen, which was part of an over-the-counter supplement he was taking.
Woj adds that a source tells him there was no trace of steroids or PED in his positive test and that “there was no intent” by Calathes to violate the policy.
Calathes’ 20-game suspension starts immediately and takes him out for the Grizzlies’ upcoming playoff series against the Oklahoma City Thunder. Calathes provides depth in the Grizzlies’ backcourt and has averaged 4.9 points and 2.9 assists in 16.5 minutes per game this season.
Tamoxifen is used to block the spread of breast cancer.