Updated at 4:15 p.m.
Browns coach Mike Pettine said Pro Bowl tight end Jordan Cameron was excused from practice Monday.
Pettine declined to elaborate.
"He's just dealing with an issue," Pettine said. "He was excused today from practice.
"I won't go into any other detail on that."
Pettine said "the expectation" is Cameron's absence will last only one day.
The absence was not related to the sprained AC joint Cameron suffered in a shoulder Aug. 2 during the team's intrasquad scrimmage at the University of Akron, a source familiar with the situation said. The source spoke on condition of anonymity because Pettine wouldn't provide details.
Cameron missed the preseason opener Aug. 9 with the injury, but returned to action for the second exhibition game Aug. 18. He played again in the third preseason game Saturday night, when he had two catches for 18 yards in a 33-14 loss to the St. Louis Rams.
During a conference call Sunday afternoon, Pettine said none of his players suffered an injury of note Saturday night.
"It was all minor stuff," Pettine said. "Nothing happened to anybody that played in the game that I think would keep them out of this week’s game [Thursday night against the Chicago Bears]."
Cornerback Buster Skrine (recent thumb surgery), defensive end Desmond Bryant (recent wrist surgery), linebackers Darius Eubanks (shoulder) and Eric Martin (concussion) and offensive lineman Michael Bowie (shoulder) also missed practice.
Cornerbacks Joe Haden (foot), Isaiah Trufant (knee) and Pierre Desir (knee) did not practice. They were on the field working out on stationary bikes during the 30-minute portion of practice open to the media.
Wide receiver Nate Burleson practiced Monday for first time since Aug. 6, when he suffered a strained hamstring. Cornerback K'Waun Williams (hamstring) also returned to action.
All-Pro wide receiver Josh Gordon (abdominal) practiced Monday despite not playing Saturday night.