Cardinals assistant Jen Welter became the first woman to coach an NFL game, the same night the league's first full-time female on-field official made her preseason debut.

Welter worked Saturday night's game against the Chiefs as an inside linebackers coach, while Sarah Thomas served as the line judge in the seven-person officiating crew.

Welter is serving a six-week coaching internship that will include Arizona's training camp and four preseason games. Thomas is now a full-time official, a move that has generated plenty of attention in the male-dominated NFL.

Rivers gets extension

The San Diego Chargers said they have agreed to a contract extension with quarterback Philip Rivers through 2019.

The extension, announced Saturday night, comes as team chairman Dean Spanos has angered many Chargers fans by exploring a move to the Los Angeles area.

Financial details weren't immediately available, but it is believed Rivers, 33, will average at least $20 million annually in the new deal. Rivers is entering the final year of a six-year extension he signed in August 2009 worth $93 million.

Rivers has been San Diego's starting quarterback since 2006. He played through back and chest injuries in 2014.

Giants lose two safeties

The inexperienced group of safeties for the Giants just lost two players.

Rookie Mykkele Thompson will miss the season because of an Achilles' tendon injury, and projected starter Landon Collins will be sidelined for at least a week with a sprained knee, coach Tom Coughlin announced Saturday.

Thompson and Collins were hurt in the first half of the Giants' 23-10 preseason loss at Cincinnati on Friday night. Collins is a second-round draft pick, and the Giants grabbed Thompson in the fifth round.

Etc.

• Sam Bradford won't play for the Eagles, but Tim Tebow will take his first snaps in an NFL game since the 2013 preseason when Philadelphia plays the Colts on Sunday. Mark Sanchez will start.

• Arizona's Carson Palmer was flawless in a brief appearance, Kansas City backup Chase Daniel threw for three touchdowns and the Chiefs beat the host Cardinals 34-19 in the teams' preseason opener Saturday night. Palmer, in his first game since tearing an ACL last Nov. 9, was 4 for 4 for 77 yards in an opening TD drive.

• Brian Hoyer threw a 58-yard touchdown pass to Cecil Shorts III on Houston's first drive in the host Texans' 23-10 victory over the San Francisco 49ers in the preseason opener for both teams.