Josh Gordon tested positive for alcohol and will now be subject to a one-year suspension.
"Clearly we are very disappointed to hear the latest report regarding Josh," the Browns said in a statement. "At this point, due to the confidential nature of the NFL's substance-abuse policy, we have not been made aware by the league of a failed test. We are in the process of gathering more information and will provide further comment at the appropriate time."
Gordon was arrested on July 5, 2014, and charged with driving while impaired after speeding down a street in Raleigh, North Carolina. Gordon was previously suspended for the first two games of the 2013 season for violating the league's substance-abuse policy.
Gordon would have been suspended for all of 2014 were it not for a new drug testing and punishment policy the NFL implemented that allowed him to return after missing the first 10 games.
Gordon caught 24 passes for 303 yards in five games this season. He led the NFL with 1,646 yards in just 14 games in the 2013 season.
