Bradford (concussion/shoulder) is listed as inactive Thursday at Detroit, Geoff Mosher of CSN Philadelphia reports.
Although Bradford took part in a pregame warmup to test out his shoulder, he won't start and, in fact, not even suit up, missing his second consecutive contest. The Eagles will instead turn to Mark Sanchez under center.
Ertz (concussion) has been ruled out for Thursday's contest at Detroit.
With only three days to recover from a concussion suffered Sunday versus the Buccaneers, Ertz was able to progress to a limited showing in Wednesday's practice, according to Zach Berman of the Philadelphia Inquirer. However, he was unable to complete all phases of the league's protocol for head injuries. His next opportunity to suit up arrives on Dec. 6 in New England.
Mathews (concussion) has been ruled out for Thursday's game in Detroit.
Mathews has made little progress in his quest through the concussion protocol, leaving the Eagles to trust in DeMarco Murray, Darren Sproles, and, to a lesser extent, Kenjon Barner out of the backfield. His next chance to take the field arrives on Dec. 6 at New England.
Buccaneers defensive end George Johnson appeared in a career-high 16 games in 2014 for the Lions, but he made no starts. He mostly was a rotational pass rusher last year, but the job seemed to suit him well, as he totaled a career-best six sacks.
Seferian-Jenkins saw the practice field on a limited basis each day this week, but the tight end actually ended up with a doubtful tag despite being listed as questionable in the previous three weeks. At this point, it's unclear if Tampa Bay is expecting the 23-year-old to return to the field some time during the regular season. In the meantime, the Buccaneers' tight end group will continue to be led by the likes of Luke Stocker and Brandon Myers. Out of those two, it will be Stocker who gets the starting nod.