Philip Rivers warms up ahead of the 2018 home opener against the Kansas City Chiefs at StubHub Center on Sunday, Sept. 9, 2018.

Philip Rivers looks to pass during the 2018 home opener against the Kansas City Chiefs at StubHub Center on Sunday, Sept. 9, 2018.

Philip Rivers looks onto the field ahead of a matchup against the Buffalo Bills at New Era Field on Sunday, Sept. 16, 2018.

Philip Rivers looks to throw against the San Francisco 49ers at StubHub Center on Sunday, Sept. 30, 2018.

Philip Rivers at the line of scrimmage against the Oakland Raiders at StubHub Center on Sunday, Oct. 7, 2018.

Philip Rivers throws the ball against the Oakland Raiders at StubHub Center on Sunday, Oct. 7, 2018.

Philip Rivers throws against the Oakland Raiders on Sunday, Oct. 7, 2018 at StubHub Center.

Philip Rivers warms up against the Cleveland Browns at FirstEnergy Stadium on Sunday, Oct. 14, 2018.

Philip Rivers get ready to throw against the Cleveland Browns at FirstEnergy Stadium on Sunday, Oct. 14, 2018.

Philip Rivers walks out onto the field at Wembley Stadium in London on Sunday, Oct. 21, 2018.

Philip Rivers warms up at Wembley Stadium in London on Sunday, Oct. 21, 2018.

Philip Rivers at the line of scrimmage versus the Tennessee Titans at Wembley Stadium in London on Sunday, Oct. 21, 2018.

Philip Rivers looks to pass versus the Tennessee Titans at Wembley Stadium in London on Sunday, Oct. 21, 2018.

Philip Rivers gets ready to throw against the Tennessee Titans at Wembley Stadium in London on Sunday, Oct. 21, 2018.

Philip Rivers celebrates in the locker room after a victory versus the Tennessee Titans at Wembley Stadium in London on Sunday, Oct. 21, 2018.

Philip Rivers smiles as he takes the field against the Seattle Seahawks on Sunday, Nov 4, 2018 at CenturyLink Field.

Philip Rivers holds onto the ball against the Seattle Seahawks on Sunday, Nov 4, 2018 at CenturyLink Field.

Philip Rivers celebrates a touchdown against the Seattle Seahawks on Sunday, Nov 4, 2018 at CenturyLink Field.

Philip Rivers embraces Bolt fans after a victory over the Seattle Seahawks on Sunday, Nov 4, 2018 at CenturyLink Field.

Philip Rivers points ahead at the line of scrimmage against the Oakland Raiders on Sunday, Nov 11, 2018 at Oakland-Alameda Coliseum.

Philip Rivers holds up the number one against the Oakland Raiders on Sunday, Nov 11, 2018 at Oakland-Alameda Coliseum.

Philip Rivers gets ready to throw against the Denver Broncos on Sunday, Nov 18, 2018 at StubHub Center.

Philip Rivers communicates at the line of scrimmage against the Arizona Cardinals on Sunday, Nov. 25, 2018 at StubHub Center.

Philip Rivers smiles against the Arizona Cardinals on Sunday, Nov. 25, 2018 at StubHub Center.

Philip Rivers is greeted by fans after a victory against the Arizona Cardinals on Sunday, Nov. 25, 2018 at StubHub Center.

Philip Rivers sets up against the Pittsburgh Steelers on Sunday, Dec. 2, 2018 at Heinz Field.

Philip Rivers gets ready for a play against the Pittsburgh Steelers on Sunday, Dec. 2, 2018 at Heinz Field.

Philip Rivers high fives WR Travis Benjamin after scoring a touchdown against the Pittsburgh Steelers on Sunday, Dec. 2, 2018 at Heinz Field.

Philip Rivers reacts during a play against the Pittsburgh Steelers on Sunday, Dec. 2, 2018 at Heinz Field.

Philip Rivers throws the ball against the Cincinnati Bengals on Sunday, Dec. 9, 2018 at StubHub Center.

Philip Rivers throws the ball to TE Antonio Gates against the Cincinnati Bengals on Sunday, Dec. 9, 2018 at StubHub Center.

Philip Rivers gets ready to throw against the Kansas City Chiefs on Thursday, Dec. 13, 2018 at Arrowhead Stadium.

Philip Rivers points downfield against the Kansas City Chiefs on Thursday, Dec. 13, 2018 at Arrowhead Stadium.

Philip Rivers runs with the ball against the Kansas City Chiefs on Thursday, Dec. 13, 2018 at Arrowhead Stadium.

Philip Rivers completes a pass to Mike Williams against the Kansas City Chiefs on Thursday, Dec. 13, 2018 at Arrowhead Stadium.

Philip Rivers throws the ball against the Denver Broncos on Sunday, Dec. 30, 2018 at Broncos Stadium at Mile High.

Philip Rivers looks to pass during the Wild Card game against the Baltimore Ravens on Sunday, Jan. 6, 2019 at M&T Bank Stadium.

Philip Rivers runs for a first down during the Wild Card game against the Baltimore Ravens on Sunday, Jan. 6, 2019 at M&T Bank Stadium.

Philip Rivers signals a first down during the Wild Card game against the Baltimore Ravens on Sunday, Jan. 6, 2019 at M&T Bank Stadium.

Philip Rivers celebrates with fans after a Wild Card victory against the Baltimore Ravens on Sunday, Jan. 6, 2019 at M&T Bank Stadium.

Philip Rivers holds the ball during the Divisional game against the New England Patriots on Sunday, Jan. 13, 2019 at Gillette Stadium.