Spanos made his decision Tuesday, two days after the Chargers finished 8-8 by beating Oakland to keep the Raiders out of the playoffs.
“Bottom line, I believe these two men give us the best chance to get back to the playoffs,” Spanos said in a statement. “A.J. Smith is the best man to improve our roster, and Norv Turner is the best man to lead that roster on the field.”
Turner is 49-31 in five years in San Diego but only 3-3 in the playoffs.
BEARS: Lovie Smith is keeping his job as head coach, but Chicago fired general manager Jerry Angelo and offensive coordinator Mike Martz.
The changes come after the Bears finished 8-8 following a collapse marked by season-ending injuries to quarterback Jay Cutler and running back Matt Forte, along with the arrest of backup receiver Sam Hurd on federal drug charges.
EAGLES: Chairman Jeffrey Lurie said coach Andy Reid will return for his 14th season in Philadelphia, though he left open the possibility for changes on the coaching staff.
Team president Joe Banner and general manager Howie Roseman also will return.
DOLPHINS: Jeff Fisher interviewed for Miami’s head coaching job.
He is believed to be the top choice, and owner Stephen Ross is willing to pay big money, but competition from other NFL teams might be fierce.
SAINTS: Placed rookie running back Mark Ingram and linebacker Will Herring on injured reserve, ending their seasons.
BROWNS: Coach Pat Shurmur sidestepped questions about the futures of quarterback Colt McCoy and running back Peyton Hillis.
All Shurmur would commit to in 2012 was hiring an offensive coordinator. He served both roles of coach and coordinator this season.
STEELERS: Will begin their quest for a second consecutive AFC title in Denver on Sunday without safety Ryan Clark, who will be held out of the lineup as a precaution because of a sickle-cell trait that becomes aggravated when playing at higher elevations.
SUPER BOWL ADS: NBC has sold all the commercial airtime for the Feb. 5 game in Indianapolis and even has a waiting list of advertisers.
The average cost for a 30-second spot this year was $3.5 million, with some time slots costing as much as $4 million.
LEAGUE AWARDS: The Associated Press and the NFL will announce the annual league awards, including Most Valuable Player, in a two-hour prime-time special NFL Honors to air on NBC on Super Bowl eve, Feb. 4.
All seven awards will be presented from 9-11 p.m. live from the Murat Theater in Indianapolis.