Philip Rivers will be wearing a new uniform in 2020.
Tom Brady might wear a new one, too.
They will be, however, far from the first quarterbacks to wear a different jersey after becoming synonymous with one team.
Joe Namath’s time with the 1977 Rams is the most oft-cited example as a quarterback looking strange in a different uniform.

Here are 19 other examples:
Joe Montana, Kansas City Chiefs

Montana played his final two seasons in Kansas City, reaching the AFC title game in 1993.
Warren Moon, Kansas City Chiefs

Moon started one game for Kansas City in 2000 at the age of 44.
Donovan McNabb, Minnesota Vikings

McNabb started six games for the 2011 Vikings, going 1-5 and throwing only four touchdown passes before being benched for Christian Ponder. He was waived from the team in December.
Brett Favre, Minnesota Vikings

It’s not like Favre’s time with the Vikings flew under the radar — the team made the 2009 NFC title game — but it’s still weird to see him wearing purple.
Johnny Unitas, San Diego Chargers

The Baltimore Colts traded 40-year-old Unitas before the 1973 season. He started four games, before giving way to a rookie (and future fellow Hall of Famer) named Dan Fouts.
Steve Young, Buccaneers

Young’s “weird” team came at the front of his career. The future Hall of Famer started 19 games for the Buccaneers and was traded to San Francisco after the team took Vinny Testaverde No. 1 in the 1987 NFL draft.
Jim McMahon, Philadelphia Eagles

The “punky QB” played for several teams after winning Super Bowl XX with the Bears. He started games for the Chargers, Eagles, Vikings and Cardinals and was a backup to Brett Favre during the Packers’ Super Bowl win.
Randall Cunningham, Baltimore Ravens

Cunningham was Elvis Grbac’s backup during the 2001 season and went 2-0 as a starter during his final year in the league.
Kordell Stewart, Chicago Bears

Stewart spent eight seasons with the Steelers before being released and signing with the Bears as a free agent in 2003. He was benched for Chris Chandler, regained his job and then benched for Rex Grossman near the end of the season. He would play one more year with the Ravens in 2004.
Matt Hasselbeck, Indianapolis Colts

A Seahawks legend, Hasselbeck finished his career by being Andrew Luck’s backup for three seasons. He started eight games in 2015 at the age of 40, going 5-3 before retiring in the offseason.
Rex Grossman, Houston Texans

Grossman signed a one-year contract with the Texans in 2009 after the Bears declined to sign him to a new contract. He only got into one game with the Texans, throwing nine passes for three completions and one interception. Three years as a backup with the Redskins would follow.
Michael Vick, Pittsburgh Steelers

Vick started three games for the 2015 Steelers after Ben Roethlisberger went down with an injury. He went 2-1 before getting hurt himself and being replaced by Landry Jones.
Steve McNair, Baltimore Ravens

The Titans traded McNair to the Ravens before the 2006 season. McNair started every game for the Ravens that year but struggled through an injury-filled 2007. He announced his retirement in April 2008.
Daunte Culpepper, Detroit Lions

Culpepper started a total of 10 games for the Lions across the 2008 and 2009 seasons.
Jay Cutler, Miami Dolphins

An injury to Ryan Tannehill lured Cutler out of retirement for the 2017 season. Cutler went 6-8 over 14 starts for the Dolphins.
Boomer Esiason, Arizona Cardinals

Esiason started eight games for the 1996 Cardinals, throwing for 522 yards in an overtime win over Washington. He would return to the Bengals for one more season in 1997 before retiring.
Bernie Kosar, Miami Dolphins

The University of Miami product (and last good Cleveland Browns quarterback) was Dan Marino’s backup in Miami for three seasons.
Ryan Leaf, Dallas Cowboys

Leaf started three games for the 2001 Cowboys, going 0-3 in the process.
Kurt Warner, New York Giants

Warner took two different franchises to the Super Bowl. But the one he didn’t was the Giants. Warner won five of his first seven games for the 2004 Giants but lost his job to rookie Eli Manning after a two-game losing streak.