Denver Broncos quarterback Peyton Manning (18) passes against the San Francisco 49ers during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) passes against the San Francisco 49ers during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) celebrates with tight end Jacob Tamme (84) after throwing a touchdown pass to wide receiver Eric Decker against the San Francisco 49ers during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

San Francisco 49ers quarterback Alex Smith (11) passes as Denver Broncos defensive end Elvis Dumervil (92) rushes during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

Denver Broncos linebacker Wesley Woodyard (52) recovers a fumble under San Francisco 49ers offensive tackle Joe Staley (74) during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

San Francisco 49ers defensive back Perrish Cox (20) returns an interception off a throw from Denver Broncos quarterback Caleb Hanie during the second quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos linebacker Wesley Woodyard (52) celebrates with defensive back Rahim Moore (26) after recovering a fumble against the San Francisco 49ers during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

Denver Broncos running back Willis McGahee (23) rushes past San Francisco 49ers defensive tackle Justin Smith (94) during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

San Francisco 49ers tight end Vernon Davis (85) celebrates after scoring a touchdown against the Denver Broncos during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

San Francisco 49ers wide receiver Michael Crabtree (15) catches a pass in front of Denver Broncos defensive back Tracy Porter (22) during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos wide receiver Eric Decker (87) celebrates with fans after catching a touchdown pass from quarterback Peyton Manning during the first quarter of an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

San Francisco 49ers quarterback Alex Smith, bottom center, fumbles against the Denver Broncos during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

San Francisco 49ers running back Anthony Dixon (24) gets away from Denver Broncos defensive back David Bruton (30) to score on a 26-yard touchdown run during the third quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) passes against the San Francisco 49ers during the first quarter of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) calls a play at the line of scrimmage during the first quarter of an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos head coach John Fox, left, argues with an official during the second half of an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

San Francisco 49ers head coach Jim Harbaugh yells during the second half of an NFL preseason football game against the Denver Broncos in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

Denver Broncos head coach John Fox, right, argues with an official during the second half of an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) watches from the sideline during the second half of an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. (AP Photo/Jack Dempsey)

Denver Broncos wide receiver Eric Decker (87) catches a touchdown pass from quarterback Peyton Manning during the first quarter of an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

Denver Broncos head coach John Fox, left, shakes hands with San Francisco 49ers head coach Jim Harbaugh after an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. The 49ers won 29-24. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) runs off the field after an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. The 49ers won 29-24. (AP Photo/Jack Dempsey)

Denver Broncos quarterback Peyton Manning (18) celebrates after throwing a touchdown pass to wide receiver Eric Decker (87) during the first quarter of an NFL preseason football game against the San Francisco 49ers in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

San Francisco 49ers head coach Jim Harbaugh, right, argues with an official during the second quarter of an NFL preseason football game against the Denver Broncos in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

FILE - This Aug. 26, 2012 file photo shows San Francisco 49ers head coach Jim Harbaugh, right, arguing with a replacement official during the second quarter of an NFL preseason football game against the Denver Broncos, in Denver. The NFL will open the regular season with replacement officials. League executive Ray Anderson has told the 32 teams that with negotiations remaining at a standstill between the NFL and the officials' union. The replacements will be on the field beginning next Wednesday night, Sept. 5, 2012 when the Cowboys visit the Giants to open the season. (AP Photo/Joe Mahoney, File)

Denver Broncos quarterback Brock Osweiler (6) passes against the San Francisco 49ers during the second half of an NFL preseason football game in Denver, Sunday, Aug. 26, 2012. (AP Photo/Joe Mahoney)

San Francisco 49ers placekicker David Akers (2) celebrates after making a field goal during the second half of an NFL preseason football game against the Denver Broncos in Denver, Sunday, Aug. 26, 2012. The 49ers won 29-24. (AP Photo/Joe Mahoney)

FILE - In this Aug. 26, 2012, file photo, San Francisco 49ers quarterback Alex Smith (11) passes against the Denver Broncos during the first quarter of an NFL preseason football game in Denver. With all 11 defensive starters for one of the league's best units of last year returning and the addition of several veteran playmakers in free agency, the 49ers are built not only to return to the postseason this time but reach the Super Bowl. The 49ers are scheduled to begin their regular season on Sept. 9 at the Green Bay Packers. (AP Photo/Joe Mahoney, File)

FILE - In this file photo taken Aug. 26, 2012, Denver Broncos quarterback Peyton Manning (18) warms up before an NFL preseason football game against the San Francisco 49ers in Denver. John Elway lured Manning to Denver with a five-year, $96 million deal, yet the 36-year-old quarterback is admittedly on a year-to-year basis, which means he's all about winning now, not presiding over a rebuilding project. (AP Photo/Jack Dempsey, File)

FILE - In this Aug. 26, 2012, file photo, Denver Broncos quarterback Peyton Manning (18) passes against the San Francisco 49ers during the first quarter of an NFL preseason football game in Denver. No need to ask Steelers coach Mike Tomlin if Peyton Manning is back. As far as Tomlin is concerned, the Broncos quarterback never left. (AP Photo/Jack Dempsey, File)

ADVANCE FOR WEEKEND EDITIONS, SEPT. 8-9 - FILE - In this Aug. 26, 2012, file photo, Denver Broncos quarterback Peyton Manning (18) warms up before a preseason NFL football game against the San Francisco 49ers in Denver. When the four-time MVP takes the field Sunday night for the Denver Broncos' opener against the Pittsburgh Steelers, it will have been 1 year, 8 months and 2 days since his last meaningful snap. (AP Photo/Jack Dempsey, File)