Cowboys safety Barry Church will miss the remainder of the season after suffering a ruptured Achilles tendon against Tampa Bay on Sunday. With veteran sidekick Gerald Sensabaugh (calf) and Matt Johnson (hamstring) also out against the Bucs, Mana Silva was thrust into significant playing time. It's a big setback for Church, an undrafted rookie in 2010 who finally earned the starting job this season. "It's disappointing but I have to stay upbeat and positive for the team," Church told the Fort Worth Star-Telegram. "I will continue to do that." Church said he might have been vulnerable to the Achilles injury while playing through a quad bruise suffered to the same leg at Seattle in Week 2. "It was run play," Church said. "I think it was a freak accident. I went to help on the run and soon as I planted it popped."