The Denver Post cited unnamed major-league sources in revealing that Blackmon, left-handed pitcher Phillip Diehl and right-hander Ryan Castellani tested positive after taking part in recent workouts at Coors Field.
The news comes as Major League Baseball players are preparing to report to their home parks to begin ramping up preparations for the 2020 season. MLB and its players just finalized safety protocols Tuesday evening that paved the way for a 60-game season to start in late July.
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The three Rockies join a growing list of at least 15 major-league players and staff members who have tested positive for COVID-19. On Friday, MLB decided to immediately shut down all spring training facilities in Arizona and Florida.
Blackmon, a four-time All-Star and the 2017 NL batting champion, becomes the most high-profile major leaguer to have contracted the disease caused by the novel coronavirus.
Sources tell the Post the test results came back late last week with one player showing symptoms and the other two asymptomatic. Other players working out at Coors Field were also tested and their results were negative.