Vilma, who missed practice all week, was listed as out on the team's injury report Friday and it's uncertain how long the former Pro Bowl linebacker will be sidelined.
"You don't rule anybody out in terms of injuries," Mangini said. "It's too different person by person. It's something that if you go one way, a lot of time, the opposite happens. So we always go through the full process, the full level of rehab."
Apparently, that process ended sometime Friday when it was determined Vilma wasn't going to be able to play. Published reports have speculated the injury could be serious and potentially require season-ending surgery, but Mangini has been evasive when asked if that's a possibility.
Vilma hasn't been available to the media since Sunday. Several messages and e-mails left for Tony Fleming, one of Vilma's representatives, weren't immediately answered.
It's uncertain at what point Vilma's injury occurred and Mangini has declined to say whether it is to the linebacker's right or left knee. Except for a stretch during the third quarter at Cincinnati, Vilma was on the field for most of the defensive plays.
Since being chosen in the first round in the 2004 draft, Vilma has played in every Jets game and started all but two. After establishing himself as one of the best playmaking linebackers in the league during his first two seasons, Vilma has struggled to be as effective in Mangini's 3-4 defensive scheme. He's fifth on the team with 39 tackles.
"We're so used to him being out there, hearing his voice and knowing where he's going to be that it's going to be strange," safety Kerry Rhodes said. "It'll be like Ed Reed without Ray Lewis."
Copyright 2007 by The Associated Press