Braelon Allen: Everything you need to know

Coach Aaron Glenn revealed Friday that Allen (knee) is expected to miss 8-12 weeks, Rich Cimini of ESPN.com reports. Per Cimini, it hasn't yet been determined if Allen -- who was placed on IR on Thursday -- will undergo surgery on his knee or recover via rehab, but either way, the timetable estimate will remain in the 8-12 week range. In Allen's absence, Isaiah Davis, as well as newcomer Khalil Herbert and Kene Nwangwu (hamstring) -- when healthy -- are slated to work behind top back Breece Hall.

The Jets officially placed Allen (knee) on IR on Thursday. The expected move freed up a roster spot for the team's addition of fellow running back Khalil Herbert. Allen thus is slated to miss a minimum of four games, though it's possible that his stint on IR could continue beyond that, with Rich Cimini of ESPN.com noting that the RB's injury is still being evaluated, and surgery is considered a possibility. In Allen's absence, Isaiah Davis, Herbert and Kene Nwangwu (hamstring) -- when healthy -- will provide depth behind top back Breece Hall.

The Jets intend to place Allen (knee) on injured reserve Thursday, Rich Cimini of ESPN.com reports. Allen is recovering from an MCL sprain sustained in Monday's 27-21 loss to the Dolphins, and while a formal timeline for his return won't be established until a decision is made whether he'll require surgery, the 21-year-old will be sidelined for at least the Jets' next four games. New York could add another running back to its roster in a corresponding move when Allen is officially placed on IR, but as it stands, Isaiah Davis and Kene Nwangwu (hamstring) are the backfield options behind starter Breece Hall.