Greg Biffle has confirmed that after 19 seasons as part of Roush Fenway Racing, he will not drive for the organisation in 2017.
It remains unclear whether Biffle will be able to find a ride at another team or if he will retire from the sport.
He has hinted at moving into the media where he his popularity amongst his fellow drivers would prove a great asset.
Biffle was a mainstay at the once powerful Ford squad, but since the departure of the likes of Matt Kenseth and Carl Edwards in recent seasons to Joe Gibbs Racing, the Jack Roush outfit has not figured as serious contenders.
Winless through the last three seasons, Biffle this year missed the chase for the second time in succession, ending the campaign 23rd in points.
Roush is reportedly weighing up whether to operate the #16 entry full-time at all next year as it struggles for sponsorship.
Biffle's achievements at Roush Fenway Racing have included titles in the Truck (2000) and Xfinity Series (2002) and finishing runner-up in the Sprint Cup Series in 2005.
“We've had an incredible run and I am so appreciative for the opportunity to be a part of Roush Fenway,” said Biffle.
“I'm extremely proud of everything we have been able to accomplish over the last 19 years – both on and off the track. I've enjoyed every minute.
“I'm excited about the next chapter of my life, and I look forward to exploring other opportunities – particularly in radio and television – both inside and outside of NASCAR.”
Biffle's stats include 19 wins, 13 poles, 92 top five finishes and 175 top 10s in the Sprint Cup. Since the Chase was introduced in 2004, Biffle has qualified seven times.
He has also won 20 races in the second-tier Xfinity Series and 14 poles in 244 starts. In 81 truck starts, Biffle scored 16 wins, 12 poles, 42 top fives and 54 top 10 finishes. He earned rookie honours in both of those series.
“I don't have the words to say what Greg has meant to this organisation,” said team owner Jack Roush.
“He is a true racer who has always exhibited a will to win and an intense passion for speed.
“For almost two decades Greg has given us an opportunity to run up front and compete for wins.”
Biffle's best performance this year came with pole and an eighth place finish at the Coke Zero 400 at Daytona.
His last win came at Michigan in 2013 which was also Ford's 1000th win in NASCAR.