Chargers add third quarterback

The San Diego Chargers decided they felt more comfortable with three quarterbacks on the 53-man roster, so they agreed to terms with veteran J.T. O’Sullivan.

O’Sullivan was cut by Cincinnati during the weekend. He will play behind starter Philip Rivers and backup Billy Volek, who was held out of practice Monday.

O’Sullivan replaces Charlie Whitehurst as San Diego’s No. 3 quarterback. Whitehurst was traded to Seattle in the offseason. The team cut rookie Jonathan Crompton and he was put on the practice squad.

The Chargers chose O’Sullivan over Crompton because of experience. O’Sullivan, 31, has been in the league since 2002 and he has thrown 145 career passes. This is O’Sullivan’s ninth NFL team.