San Francisco 49ers head coach Jim Tomsula, left, talks with Pittsburgh Steelers head coach Mike Tomlin, right, on the field before an NFL football game Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Keith Srakocic)

San Francisco 49ers head coach Jim Tomsula takes the field before an NFL football game against the Pittsburgh Steelers, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Keith Srakocic)

San Francisco 49ers quarterback Colin Kaepernick (7) scrambles to pass after evading Pittsburgh Steelers outside linebacker Arthur Moats (55) in the first quarter of an NFL football game, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Gene Puskar)

Pittsburgh Steelers Vince Williams (98), Shamarko Thomas (29) and teammates leap as they take the field for the start of their home opener NFL football game against the San Francisco 49ers, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Gene Puskar)

San Francisco 49ers quarterback Colin Kaepernick (7) scrambles to pass after evading Pittsburgh Steelers outside linebacker Arthur Moats (55) in the first quarter of an NFL football game, Sunday, Sept. 20, 2015 in Pittsburgh. (AP Photo/Gene Puskar)

San Francisco 49ers running back Carlos Hyde (28) runs the ball past Pittsburgh Steelers inside linebacker Ryan Shazier (50) in the first quarter of an NFL football game, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Gene J. Puskar)

San Francisco 49ers quarterback Colin Kaepernick (7) gets off a pass as Pittsburgh Steelers outside linebacker Arthur Moats (55) pressures in the third quarter of an NFL football game, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Don Wright)

Pittsburgh Steelers wide receiver Antonio Brown (84) makes a catch past San Francisco 49ers free safety Eric Reid (35) in the first quarter of an NFL football game, Sunday, Sept. 20, 2015 in Pittsburgh. (AP Photo/Keith Srakocic)

Pittsburgh Steelers running back DeAngelo Williams (34) scores a touchdown against the defense of San Francisco 49ers defensive tackle Tank Carradine (95) in an NFL football game, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Don Wright)

San Francisco 49ers wide receiver Anquan Boldin (81) drags his toes as he makes a catch past Pittsburgh Steelers defensive back Brandon Boykin (25) for a touchdown in the fourth quarter of an NFL football game, Sunday, Sept. 20, 2015 in Pittsburgh. The Steelers won 43-18. (AP Photo/Gene J. Puskar)

Pittsburgh Steelers linebacker Bud Dupree (48) sacks San Francisco 49ers quarterback Colin Kaepernick (7) in the fourth quarter of an NFL football game, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Gene J. Puskar)

Pittsburgh Steelers running back DeAngelo Williams (34) is greeted by center Cody Wallace (72) after scoring a touchdown in the second quarter of an NFL football game against the San Francisco 49ers, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Gene J. Puskar)

San Francisco 49ers quarterback Colin Kaepernick (7) walks off the field after an NFL football game against the Pittsburgh Steelers at Heinz Field in Pittsburgh, Sunday, Sept. 20, 2015. The Steelers won 43-18. (AP Photo/Gene J. Puskar)

San Francisco 49ers quarterback Colin Kaepernick, left, hands his cap to a young fan as he walks off the field after an NFL football game against the Pittsburgh Steelers at Heinz Field in Pittsburgh, Sunday, Sept. 20, 2015. The Steelers won 43-18. (AP Photo/Gene J. Puskar)

Pittsburgh Steelers running back DeAngelo Williams (34) celebrates with teammates on the sidelines after rushing for his third touchdown of the game during the second half of an NFL football game against the San Francisco 49ers in Pittsburgh, Sunday, Sept. 20, 2015. The Steelers won 43-18. (AP Photo/Gene J. Puskar)

Pittsburgh Steelers wide receiver Antonio Brown (84) twists away from San Francisco 49ers cornerback Tramaine Brock (26) to go for a big gain after making a catch in the second quarter of an NFL football game, Sunday, Sept. 20, 2015, in Pittsburgh. (AP Photo/Don Wright)