McKelvin, also a key special teams player for the Bills, went out late in the third quarter with a rib injury. He was hurt while scrambling to recover a muffed punt by Jets returner Antonio Cromartie. McKelvin had to be helped to the sideline after recovering the ball in a pile of players.
DeVito left in the third quarter with a right knee injury. He was hurt on a third-down completion to C.J. Spiller that lost 3 yards for Buffalo.
The Jets beat the Bills 28-24.
Information from The Associated Press was used in this report.