From players getting COVID-19 vaccinations to relaxed coronavirus protocols to lineup issues, particularly at quarterback, the NFL faces a multitude of questions as training camps open.

The Titans traded Casey to Denver this offseason in a salary dump, clearing $11 million in cap space by sending the five-time Pro Bowl defensive lineman to Denver for a seventh-round draft choice. Even with Casey on his side last year, Henry was stifled in a 16-0 loss at Denver, gaining just 28 yards on 15 carries. That was easily the low point in a season in which Henry ran for an NFL-best 1,540 yards. “Having a player of his caliber and his leadership not be out there with us is definitely going to be a blow to the team," Casey said. “He’s a game wrecker,” Henry said.

(AP Photo/Charles Rex Arbogast)The Kansas City Chiefs get reigning NFL MVP Patrick Mahomes back after a shorter-than-expected absence. ___BALTIMORE AT CINCINNATIRavens: QB Trace McSorley, WR Chris Moore, WR Jaleel Scott, CB Cyrus Jones, G Ben Powers, DT Daylon Mack, DE Ufomba Kamalu. ___DETROIT AT CHICAGOLions: QB Matthew Stafford, S Tracy Walker, CB Michael Jackson, S Miles Killebrew, G Beau Benzschawel, DL Da'Shawn Hand, DE Romeo Okwara. Bears: TE Adam Shaheen, DB Duke Shelley, LB Isaiah Irving, LB Josh Woods, G Alex Bars, DL Abdullah Anderson, WR Riley Ridley. Titans: TE Delanie Walker, DL Jurrell Casey, WR Corey Davis, LB Jayon Brown, CB Tye Smith, OL Kevin Pamphile, OL Hroniss Grasu.