FLORHAM PARK, N.J. -- New York Jets running back Braelon Allen , a key component in the team's third-ranked rushing offense, will be sidelined indefinitely with what was described by coach Aaron Glenn as "a pretty serious knee injury."

Allen appears headed to injured reserve, meaning he'd miss at least four games, but the Jets haven't made that official. They're waiting on the outcome of a second opinion, according to Glenn. The injury reportedly is a sprained MCL, which happened Monday night in their 27-21 loss to the Miami Dolphins .

"We're still going through exactly how we're going to designate that, so give me a little bit of time with that so we can try to figure it out," Glenn said Wednesday. "We'll see exactly where he's going to be when it comes to designate whether he wil

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