Team doctors examined Gordon, and in addition to a hamstring issue, there was concern that perhaps he had relapsed and was struggling with his substance use again.
General manager John Dorsey issued the following statement in regards to the move.
Gordon was late to the facility today, Rapoport reported.
The 27-year-old receiver has had a tumultuous career in the National Football League filled with highs and lows.
Gordon returned to the team days prior to the preseason finale after spending almost a month tending to those personal matters.
The stunning news came just hours after the Browns said Gordon would miss Sunday's game in New Orleans with a hamstring injury. He even caught the game-tying touchdown from Tyrod Taylor.
The league's leading receiver in 2013, Gordon caught one pass for a 17-yard touchdown in last week's tie against the Pittsburgh Steelers. Per a report from Mary Kay Cabot of the Cleveland Plain Dealer, the Browns were anxious Gordon had a relapse in his substance abuse addiction.
However, after that Pro Bowl season, Gordon was suspended for 44 consecutive games dating back to the final week of the 2014 season, which was a team ban for reportedly missing a walk-through prior to a trip to Baltimore to play the Ravens. Additionally, Gordon was on the receiving end of five passes that went for gains of at least 20 yards and converted 12 first downs.