It's the end of an era in the AFC West. The Chargers announced Monday that the team and 16-year quarterback Philip Rivers have decided to mutually part ways.

The 38-year-old quarterback will enter free agency this offseason.

“In anything you do, it’s the people you do it with that make it special. There are so many relationships and memories with coaches, support staff and teammates that will last forever, and for that I am so thankful."



Philip Rivers to Enter Free Agency » https://t.co/njeTsCbi1D pic.twitter.com/bCKXKTRePh — Los Angeles Chargers (@Chargers) February 10, 2020

"There's only one Philip Rivers, and we've been fortunate to call him our QB1 for the better part of two decades," the team wrote in a statement. "We cannot thank Philip enough for giving it his all on every single down and for the memories he created that will last a lifetime."

Rivers has spent his entire career playing for the Chargers. He made his NFL debut against the Raiders in 2006 and has faced the Silver and Black 27 times. The gunslinger was the No. 4 overall pick in the 2004 NFL Draft. He has an 18-9 career record against the Raiders with 47 touchdown passes -- his most against any opponent -- and 22 interceptions.

Rivers played in all 16 games last season as the Chargers went just 5-11. He threw for 4,615 passing yards, 23 touchdowns and 20 interceptions.

[RELATED: Carr unfazed by questions on Raiders future, brother says]

The Chargers hold the No. 6 pick in the 2020 NFL Draft and could target a QB like Oregon's Justin Herbert, Alabama's Tua Tagovailoa or many others.

One thing is for certain, though. As the Raiders move to Las Vegas, one of their biggest nemeses ever will be in a new home.