The Dallas Cowboys’ Zack Martin could miss the 2021 season opener on Sept. 9 against Super-Bowl champion Tampa Bay Buccaneers after he tested positive for the CCP (Chinese Communist Party) virus. The positive COVID-19 test for the 30-year-old four-time All-Pro right guard came back on Sept. 4 after he experienced mild flu-like symptoms and loss of taste, The Dallas Morning News reported. “He’s frustrated obviously,” head coach Mike McCarthy said of Martin, who is fully vaccinated against the CCP virus. “But hey, this is the world we live in right now.” In the NFL, return-to-play protocols for fully vaccinated players require two negative tests at least 24 hours apart after being symptom-free for 48 hours. With Martin likely out, the Cowboys will again be without one of their top three offensive linemen after the trio never played together in 2020. Third-year pro Connor McGovern, who filled in for Martin when he was …