Denver Broncos' Peyton Manning (18) throws against the Houston Texans during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/Patric Schneider)

Denver Broncos' Demaryius Thomas (88) cannot make a catch as Houston Texans' Kevin Johnson (30) defends against him during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/Patric Schneider)

Denver Broncos' Peyton Manning (18) looks to throw against the Houston Texans during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/George Bridges)

Denver Broncos' Peyton Manning (18) hands off to C.J. Anderson (22) during the first half of an NFL preseason football game against the Houston Texans, Saturday, Aug. 22, 2015, in Houston. (AP Photo/George Bridges)

Houston Texans' Ryan Mallett (15) throws against the Denver Broncos during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/George Bridges)

Houston Texans' Nate Washington (85) moves past Denver Broncos' Darian Stewart (26) after a reception during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/Patric Schneider)

Denver Broncos' Peyton Manning (18) throws against the Houston Texans during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/George Bridges)

Denver Broncos' C.J. Anderson (22) tries to sidestep Houston Texans' Mike Mohamed (54) during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/George Bridges)

Houston Texans' Ryan Mallett throws against the Denver Broncos during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/Patric Schneider)

Denver Broncos' James Casey (80) drops a pass during the first half of an NFL preseason football game against the Houston Texans, Saturday, Aug. 22, 2015, in Houston. (AP Photo/Patric Schneider)

Denver Broncos' Andre Caldwell (12) is chased by Houston Texans' A.J. Bouye (34) as he scores a touchdown during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/George Bridges)

Denver Broncos' Andre Caldwell (12) celebrates with teammate Cody Latimer (14) after Caldwell scored a touchdown against the Houston Texans during the first half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/George Bridges)

Houston Texans' Kourtnei Brown (48) scores against the Denver Broncos on an interception during the second half of an NFL preseason football game, Saturday, Aug. 22, 2015, in Houston. (AP Photo/Patric Schneider)