San Francisco 49ers tight end Vance McDonald (89) makes a catch against San Diego Chargers cornerback Steve Williams (23) during the NFL preseason game on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Francisco 49ers quarterback Colin Kaepernick (7) is hit by San Diego Chargers defensive end Corey Liuget during the NFL preseason game against the San Diego Chargers and the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Diego Chargers tight end Antonio Gates (85) catches a touchdown pass in a 21-7 preseason loss against the San Francisco 49ers on Sunday, Aug. 24, at Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Francisco 49ers quarterback Josh Johnson (1) runs between San Diego Chargers defensive tackle Ryan Carrethers, left, and linebacker Colton Underwood (49) during the second half of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Mathew Sumner)

San Francisco 49ers tight end Vernon Davis (85) runs against San Diego Chargers strong safety Marcus Gilchrist (38) during the second quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Mathew Sumner)

San Francisco 49ers wide receiver Quinton Patton (11) against the San Diego Chargers during the second quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Mathew Sumner)

San Francisco 49ers quarterback Blaine Gabbert (2) passes as running back LaMichael James (23) blocks San Diego Chargers cornerback Chris Davis (42) during the third quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Mathew Sumner)

San Francisco 49ers tight end Vance McDonald (89) scores on a 6-yard touchdown reception in front of San Diego Chargers defensive back Darrell Stuckey during the second quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Blaine Gabbert (2) drops back during the NFL preseason game against the San Diego Chargers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Diego Chargers quarterback Philip Rivers (17) runs out of the pocket during the NFL preseason game against the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Diego Chargers running back Danny Woodhead (39) is tackled by San Francisco 49ers defensive back Chris Culliver (29) during the NFL preseason game on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Diego Chargers running back Donald Brown (34) runs from San Francisco 49ers linebacker Aldon Smith during the first quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Diego Chargers tight end Antonio Gates, right, catches a 10-yard touchdown pass in front of San Francisco 49ers strong safety Craig Dahl (43) during the first quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick passes against the San Diego Chargers during the first quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) runs against San Diego Chargers defensive end Kendall Reyes, bottom, and defensive end Corey Liuget (94) during the first quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Mathew Sumner)

San Diego Chargers quarterback Philip Rivers yells at the line of scrimmage during the first quarter of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Mathew Sumner)

San Diego Chargers tight end Antonio Gates (85) celebrates after catching a 10-yard touchdown pass with running back Ryan Mathews (24) during the first quarter of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Carlos Hyde (28) runs from San Diego Chargers outside linebacker Tourek Williams (58) during the second quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers head coach Jim Harbaugh yells during the first quarter of an NFL preseason football game against the San Diego Chargers in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Diego Chargers quarterback Philip Rivers prepares to pass against the San Francisco 49ers during the first quarter of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers defensive back Dontae Johnson (36) and San Francisco 49ers strong safety Jimmie Ward (25) celebrate during the NFL preseason game against the San Diego Chargers and the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Francisco 49ers strong safety Jimmie Ward (25) runs towards the end zone, the play was later over turned during the NFL preseason game against the San Diego Chargers and the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Francisco 49ers quarterback Josh Johnson (1) runs during the NFL preseason game against the San Diego Chargers and the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Francisco 49ers inside linebacker Chris Borland (50) is filled over asSan Diego Chargers running back Marion Grice (28) runs during the NFL preseason game on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Diego Chargers quarterback Brad Sorensen (4) throws on the run during the NFL preseason game against the San Diego Chargers and the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Francisco 49ers tight end Vance McDonald (89) scores on a 6-yard touchdown reception in front of San Diego Chargers defensive back Darrell Stuckey during the second quarter of an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Josh Johnson (1) celebrates with San Francisco 49ers running back Glenn Winston (31) during the NFL preseason game against the San Diego Chargers and the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Francisco 49ers cheerleaders Gold Rush during the NFL preseason game against the San Diego Chargers and the San Francisco 49ers on Sunday, Aug. 24, 2014 at the Levi's Stadium in Santa Clara, Calif. (Ric Tapia/NFL)

San Diego Chargers head coach Mike McCoy watches from the sideline during the third quarter of an NFL preseason football game against the San Francisco 49ers in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers running back Glenn Winston (31) is congratulated by Asante Cleveland, left, and Kyle Nelson after running for a 27-yard touchdown during the fourth quarter of an NFL preseason football game against the San Diego Chargers in Santa Clara, Calif., Sunday, Aug. 24, 2014. (AP Photo/Mathew Sumner)

San Francisco 49ers tight end Vernon Davis celebrates on the sideline during the fourth quarter of an NFL preseason football game against the San Diego Chargers in Santa Clara, Calif., Sunday, Aug. 24, 2014. The 49ers won 21-7. (AP Photo/Marcio Jose Sanchez)

San Diego Chargers quarterback Philip Rivers, left, talks with San Francisco 49ers quarterback Colin Kaepernick (7) after an NFL preseason football game in Santa Clara, Calif., Sunday, Aug. 24, 2014. The 49ers won 21-7. (AP Photo/Marcio Jose Sanchez)

San Francisco 49ers quarterback Colin Kaepernick (7) walks off the field after an NFL preseason football game against the San Diego Chargers in Santa Clara, Calif., Sunday, Aug. 24, 2014. The 49ers won 21-7. (AP Photo/Marcio Jose Sanchez)