Arizona Cardinals QB Carson Palmer retires after 15 National Football League seasons

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After the better part of two seasons in Oakland with middling success, the Raiders traded Palmer to the Cardinals, where he experienced a renaissance.

"What I'll never forget are the relationships - not just the awesome teammates and coaches, but all of those countless people at the Bengals, Raiders and Cardinals who work behind the scenes to make this whole thing run".

Arizona Cardinals quarterback Carson Palmer (3) leaves the field injured during the first half of an NFL football game against Los Angeles Rams at Twickenham Stadium in London, Sunday Oct. 22, 2017.

One day removed from head coach Bruce Arians making the same announcement, Palmer will head into the sunset after 15 seasons with three different teams.

The Cardinals tweeted out an open letter from Palmer. He played eight seasons in Cincinnati, before retiring for the first time. They made it all the way to the NFC Championship game, where the Panthers showed them the door with Carolina's 49-15 win. It seemed as somewhat of a renaissance for Palmer at the time, but it did not last long as in 2016 the Cardinals finished with a 7-8-1 record.

This season, Palmer played in seven games, throwing for 1,978 yards, nine touchdowns and seven interceptions.

Palmer was signed for next season at a base salary of $12.5 million. They don't have any other quarterbacks on the roster for 2018.

Cardinals quarterbacks Drew Stanton, Blaine Gabbert and Matt Barkley are not all under contract for next season. The Cardinals now do not have any quarterbacks under contract for 2018. They'll have plenty of competition, but could also throw their hat in the ring for a high-priced free agent, like Kirk Cousins.

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