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SAN DIEGO – The Chargers agreed to terms with 19 undrafted free agents Tuesday in the first player transactions made by San Diego since the April draft.

Among those signed are a player from each of the teams in the BCS National Championship game, five wide receivers and a quarterback.

Auburn defensive end Mike Blanc and Oregon offensive tackle Bo Thran find themselves teammates six months after facing each other in college football national title matchup.

San Diego now has two quarterbacks under contract, Rivers and Wisconsin’s Scott Tolzien.

Tolzien started two seasons for the Badgers and completed 72.9 percent of his passes as a senior in a run-oriented offense. In 2010, Tolzien completed 14-of-15 passes at Michigan and 13-of-16 in a win against No. 1-ranked Ohio State, leading the Badgers to a share of the Big Ten championship and a spot in the Rose Bowl. Tolzien also attended the NFL Combine.

The five receivers include Adrian Cannon (Maryland), Vidal Hazelton (Cincinnati), Cameron Kenney (Oklahoma), Travon Patterson (Colorado) and Giovanni Stanley (Whittier).

The Chargers have some uncertainty at receiver. San Diego has used the franchise tag on Vincent Jackson, who isn’t allowed to sign until Friday. Patrick Crayton and Seyi Ajirotutu are the only other receivers under contract, and third-round pick Vincent Brown remains unsigned.

Richard Goodman and Ajirotutu both played for the Chargers last season after beginning the year as undrafted free agents. Linebacker Brandon Lang also made the roster in 2010 without being drafted.

• Arizona center Colin Baxter provides depth behind Nick Hardwick, who was the only center under contract entering Tuesday.

• Jacob Hester, who spent last season as the team’s only fullback, has some company. The Chargers signed Frank Summers, a member of Pittsburgh’s practice squad in 2010, earlier this year, and added Patrick Dimarco of South Carolina on Tuesday.

• Minnesota-Duluth running back Isaac Odim, a three-time Division II All-American, ran a reported 4.63-second 40-yard dash and posted a 38.5-inch vertical leap in a workout with NFL scouts.

• By conference, the Chargers signed five from the Big 12, four from the SEC, three from the Pac-10, two from the Big East and one from the ACC, Mountain West and Big Ten. Odim (Division II) and Giovanni (Division III) represent the small schools. Giovanni (Whittier College) is the only player of the 19 that attended college in California, though Kenney and Patterson began their careers at USC, where they were teammates of third-round draft choice and cornerback Shareece Wright.

• TCU defensive tackle Kelly Griffin, the largest, is listed as 6-foot-1, 310 pounds on the Horned Frogs’ website. He broke his ankle in October and did not play in TCU’s Rose Bowl win.