Kyle Boller told the Chargers on Saturday that he will retire, one day after signing a contract with the team.
San Diego signed Boller after backup quarterback Charlie Whitehurst suffered a strained medial collateral ligament the day before.
They are down to two quarterbacks.
"He does not want to continue to play football," head coach Norv Turner said of Boller.
Boller Abruptly Retires From Chargers