The 40-year-old McCoy, who had been the offensive coordinator for the Denver Broncos, replaces Norv Turner.
Turner was fired along with general manager A.J. Smith after the Chargers finished 7-9 and missed the playoffs for the third consecutive season.
McCoy’s hiring comes three days after the top-seeded Broncos were eliminated from the playoffs in a home loss to the Baltimore Ravens.
The coaching search was led by Tom Telesco, who was hired as Chargers GM last week. Telesco also is 40.
CHIEFS: New coach Andy Reid hired former Bears assistant Dave Toub to direct special teams on Tuesday, and announced that he’s retaining linebackers coach Gary Gibbs and defensive backs coach Emmitt Thomas from the previous staff.
Reid announced the majority of his coaching staff late last week, including Doug Pederson as offensive coordinator and Bob Sutton as the defensive coordinator.
Toub has spent the past nine seasons with the Bears. Prior to that, he worked with special teams and the defensive line for Reid in Philadelphia.
Reid still has not announced an offensive line coach, though former Dolphins coach Tony Sparano has interviewed for the job. Reid also confirmed Tuesday that he had hired Eugene Chung to be the assistant offensive line coach.
Chung also worked with Reid in Philadelphia.
PRO BOWL: Green Bay quarterback Aaron Rodgers heads a list of players who will miss the game later this month.
Rodgers said injuries to “multiple lower extremities” will keep him out of the game.
The New York Giants announced Tuesday evening that Eli Manning will be Rodgers’ replacement.
Also, Detroit Lions wide receiver Calvin Johnson, the former Georgia Tech star, has been replaced on the roster by Tampa Bay receiver Vincent Jackson.
And Cincinnati Bengals left tackle Andrew Whitworth has been added to the AFC squad, replacing Denver’s injured Ryan Clady.
Detroit long snapper Don Muhlbach has been added to the NFC team.