FLORHAM PARK, N.J. -- In non-quarterbacks news, the New York Jets practiced Wednesday without two key players, defensive end Muhammad Wilkerson and tight end Jace Amaro.

Wilkerson is battling a toe injury that could cause him to miss a game for the first time in his four-year career. The Jets haven't disclosed the nature of the injury, but he "doesn't look great," Rex Ryan said Tuesday. The coach was holding out hope that his best defensive player can play Monday night against the Miami Dolphins.

Amaro also wasn't spotted at practice during the 30-minute window open to the media. The rookie suffered a head injury Monday night and is undergoing the mandatory concussion protocol.

Defensive tackle Sheldon Richardson, whose back tightened up late in the loss to the Buffalo Bills, sat out for a portion of the early practice.