Injuries to stars leave Steelers with no margin for error

Pittsburgh Steelers defensive end Cameron Heyward reacts after a sack by teammate outside linebacker Alex Highsmith and defensive end Taco Charlton during the second half of an NFL football game against the Los Angeles Chargers, Sunday, Nov. 21, 2021, in Inglewood, Calif. (AP Photo/Marcio Jose Sanchez)

Pittsburgh Steelers quarterback Ben Roethlisberger leaves the field after an NFL football game against the Los Angeles Chargers Sunday, Nov. 21, 2021, in Inglewood, Calif. (AP Photo/Marcio Jose Sanchez)

Pittsburgh Steelers' Ben Roethlisberger is brought down by Los Angeles Chargers inside linebacker Kyler Fackrell, below, and defensive end Joey Bosa during the second half of an NFL football game Sunday, Nov. 21, 2021, in Inglewood, Calif. (AP Photo/Ashley Landis)

Los Angeles Chargers quarterback Justin Herbert is brought down by Pittsburgh Steelers defensive end Cameron Heyward during the second half of an NFL football game Sunday, Nov. 21, 2021, in Inglewood, Calif. (AP Photo/Ashley Landis)

Pittsburgh Steelers safety Miles Killebrew (28) blocks a punt by Los Angeles Chargers punter Ty Long (1) during the second half of an NFL football game Sunday, Nov. 21, 2021, in Inglewood, Calif. (AP Photo/Marcio Jose Sanchez)

Los Angeles Chargers running back Larry Rountree III runs with the ball as Pittsburgh Steelers cornerback Tre Norwood defends during the second half of an NFL football game against the Pittsburgh Steelers Sunday, Nov. 21, 2021, in Inglewood, Calif. (AP Photo/Marcio Jose Sanchez)

Pittsburgh Steelers wide receiver Diontae Johnson (18) makes a catch in the end zone for a touchdown as Los Angeles Chargers cornerback Asante Samuel Jr. defends during the first half of an NFL football game as Sunday, Nov. 21, 2021, in Inglewood, Calif. (AP Photo/Ashley Landis)