The Browns refused to disclose more details about Tucker's illness, saying only that it was a common disorder not related to football. The 10-year veteran hoped to return next season, the team said in a statement.
"It is a treatable disorder. Ryan has been battling this condition since before the season began, and has been actively receiving treatment. At this time, it is in his best interest to focus entirely on his medical treatment and concentrate on his recovery," team physician Anthony Miniaci said in a statement.
Tucker was placed on the reserve/non-football injury list on Wednesday. He missed two games earlier in the season but returned to the starting lineup on Nov. 12. He played the first half of last week's game against Cincinnati before sitting out after halftime.
* The Vikings downgraded nose tackle Pat Williams to doubtful on their injury report, putting Williams in jeopardy of missing his first game in five seasons.
* Redskins linebacker Khary Campbell, the team's leading tackler on special teams, will miss tomorrow game against Atlanta with a hamstring injury. Campbell and safety Troy Vincent were the only players not to take part in a full practice. Vincent missed last week's game with a sore hamstring, and is listed as questionable.
* The Colts figure to get a big boost against Tennessee with the expected returns of wide receiver Brandon Stokley, safety Bob Sanders and outside linebacker Gilbert Gardner.
* The Jaguars placed quarterback Byron Leftwich on injured reserve, officially ending his season 10 days after ankle surgery.
* Steelers quarterback Ben Roethlisberger will help his hometown of Findlay, Ohio, replace a police dog shot and killed when it wandered away from its handler's home. Roethlisberger plans to donate money through his foundation to buy a new dog, said Findlay Police Chief Bill Spraw.
* As part of his fine for an obscene gesture made to fans, Falcons quarterback Michael Vick is giving $5,000 to the family of a firefighter who recently died. Another $5,000 will go to The Warrick Dunn Foundation, which helps single mothers become homeowners, according to a statement posted on the team's Web site. *