Jacksonville, FL -- (Sports Network) - Jacksonville Jaguars linebacker Justin Durant has been listed as doubtful for Sunday's game against Buffalo.

Durant, suffering from a head injury, did not practice all week and is part of a maligned Jaguars defensive unit. In addition to Durant being doubtful, the team had already ruled out cornerback Rashean Mathis because of a groin injury.

Additionally, strong safety Gerald Alexander (shoulder) is questionable. Alexander, who did not play last week against the Jets, returned to practice Friday and was a full participant.