FOXBOROUGH, Mass. (AP) -- The New England Patriots have placed center Dan Koppen and defensive lineman Myron Pryor on injured reserve, ending their seasons.
They also re-signed defensive lineman Landon Cohen and signed defensive back Phillip Adams on Wednesday.
Koppen started 120 of the Patriots 129 regular-season games in his career until injuring his left ankle late in the first half of the 38-24 win in the season opener against the Miami Dolphins. He didn't play last Sunday in a 35-21 win over the San Diego Chargers.
Pryor, the Patriots sixth-round draft choice in 2009, hurt his shoulder in the first half against San Diego.
Cohen played two games for the Patriots last year and was released on Sept. 3. Adams was drafted by the San Francisco 49ers in the seventh round last year.