The Patriots promoted safety Ross Ventrone to the 53-man roster Saturday, which could be an indication that Patrick Chung might not be healthy enough to play Sunday against the Bills.
Chung had thumb surgery this week after injuring it against the Chargers. Ventrone, who had been on the Patriots practice squad, would join Josh Barrett, Sergio Brown and James Ihedigbo as the healthy safeties if Chung can't play.
The Patriots also added linebacker A.J. Edds to the practice squad. Edds was on the active roster for the first two games of the season before getting released earlier this week.
These will likely be the last transactions of the weekend, which means punter Zoltan Mesko's left knee is healthy enough for Sunday.
Rob Gronkowski will be the only tight end on the game-day roster. Aaron Hernandez was ruled out with a knee injury Friday, when Dan Gronkowski was also released, presumably with the intention of promoting Ventrone.
This will likely give wide receiver Chad Ochocinco his first chance to make a significant contribution to the offense.