The Jets may have lost safety Antonio Allen for a long time after he suffered an apparent Achilles tendon injury on Thursday.
Allen dropped to the ground during a team drill and clutched his ankle. Trainers helped him off the field and coach Todd Bowles said he was unsure of the severity of the injury but it was to an Achilles tendon.
If he tore the tendon, Allen likely would require surgery and miss the season.
Allen, a seventh-round draft pick in 2012, started eight games last season for the Jets. He moved to cornerback for a time as the Jets tried to find someone to man the position.