Both will miss the rest of the 2011 season.
Koppen broke his left ankle in the Patriots season opener in Miami. He will undergo surgery and was originally expected to be out 8-10 weeks, but a trip to the IR ends his season.
Pryor opened the season on the PUP list, but returned to play in the Patriots first two games. He recorded three tackles and .5 sacks over the two games. Pryor injured his shoulder in the second quarter on Sunday against the Chargers, and did not register on the stat sheet in the 35-21 win.
Landon Cohen will take Pryor’s spot on the 53-man roster. Cohen was signed last December and played in the final two games of the 2010 season. Cohen registered three solo tackles for the Patriots in 2010.
He was with the team in training camp and during the preseason before being released in September as part of the team’s final cuts.
Cohen is expected to practice Wednesday and could play Sunday when the Patriots take on the Bills in Buffalo.
The Patriots have also signed defensive back Philip Adams. Originally drafted by San Francisco in the seventh round, Adams played in 15 games for the 49ers in 2010 and finished with 13 total tackles and one pass defensed.
Tune in to the Patriots-Bills game Sunday at 1:00 pm on 98.5 The Sports Hub and WBZ-TV. Tune in to Patriots Gameday at 11:30am on WBZ-TV and The Sports Hub’s pregame coverage, beginning at 10:00 am. After the game tune in to the Postgame show on 98.5, and to Patriots Fifth Quarter on TV38.