Bradford, who missed two games earlier in the season with a high left ankle sprain, aggravated the injury in a 23-20 loss to Arizona on Sunday. He practiced on a limited basis Wednesday, but the soreness increased.
Spagnuolo said a decision on Bradford's status for Sunday's game at San Francisco will be made Friday. Backup A.J. Feeley took the first-team reps on Thursday.
Long said he felt fine and sat out practice as a precautionary measure. He leads the team with 10 sacks.
Copyright 2011 by The Associated Press