McLaren reserve driver Kevin Magnussen has confirmed that he will be departing the outfit following a six-year association.
Magnussen joined McLaren's young driver scheme in 2010 and competed in Formula 1 for the squad last year, claiming a podium on his debut in Australia.
Magnussen ultimately finished 11th in the 2014 championship, amassing 55 points, and the team deliberated over whether to retain him or Jenson Button alongside the returning Fernando Alonso.
McLaren chose Button, though Magnussen was retained in the capacity of test and reserve driver.
Magnussen was set to compete in this year's Australian Grand Prix in place of the injured Alonso but his MP4-30 stopped on his reconnaissance lap and he did not take the start.
McLaren has since decided to keep Button for 2016, next to Alonso, prompting Magnussen to seek employment elsewhere after a year of not racing, with his most recent track time coming at Albert Park.
"I want to say thank you to my friends at McLaren," Magnussen posted on Twitter.
"There are a lot of great people there. Good luck guys. Shame it didn't work out but I'll never give up on the dream. Watch this space."
Magnussen has not been present at a race for McLaren since he fractured his hand after falling from his bike while training in September, with his role undertaken by newly crowned GP2 champion Stoffel Vandoorne.
Magnussen has been linked to the vacant seat alongside Pastor Maldonado at Lotus, which could be taken over by Renault, for 2016, with few alternatives on the grid.