New York Jets running back Braelon Allen was placed on injured reserve with a sprained MCL on Thursday, three days after he injured his knee in a 27-21 loss to the Miami Dolphins.

Allen served as the primary kickoff returner and short-yardage back for the Jets, helping spare Breece Hall in those situations as part of the NFL’s third-ranked rushing offense (144.5 yards per game, 5.2 yards per carry).

Allen, 21, was hurt on a kickoff return in the second quarter after losing his first career fumble in the first.

Isaiah Davis has been used as the third-down back, but his role might expand.

The Jets (0-4) lost back-to-back games in Florida, 29-27 at Tampa Bay and the six-point loss to the Dolphins, and are at home to play the Dallas Cowboys (1-2-1) on Sunday. New York is looking to win for

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