Romain Grosjean and Kevin Magnussen have announced they will be leaving Haas at the end of the 2020 season.

The pair’s future at the American outfit had been in doubt with Haas boss Gunther Steiner revealing as many as 10 drivers were shortlisted for its 2021 driver line-up.

Grosjean took to social media on Thursday morning to confirm he wouldn’t be driving for Haas next year, having driven for the team since it debuted in 2016.

“The last chapter is closed and the book is finished,” Grosjean posted on Facebook. “I’ve been with Haas F1 Team since day one.

“Five years during which we went through highs and lows, scored 110 points in 92 races, but the journey was worth it. I’ve learned a lot, improved to be a better driver as well as a better man.

“I hope I’ve also helped people in the team to improve themselves. This is probably my biggest pride, more than any of the crazy first races in 2016 or the P4 at the Austrian GP 2018.

“I wish the team all the best for the future.”

Magnussen, who joined Haas in 2017 a year after Grosjean, also revealed he would not drive for the team next year.

“The 2020 Formula 1 season will be my last with Haas F1 Team,” he posted on Instagram.

“I have had a great time with the team for four years and I look back at a great journey. Being part of a brand new team has been a challenge that I have thoroughly enjoyed and it has brought me a huge amount of experience that has helped me grow and develop as a racing driver.

“I would like to thank Gene, Guenther and all of the race team for their loyalty and trust in me over the past four years.”

Reports suggest Haas will field an all-new line-up in 2021, with Formula 2 driver Nikita Mazepin tipped to fill one of the seats.

Fellow F2 driver and current championship leader Mick Schumacher is now also linked to the American squad.

Schumacher had been set to sign for Alfa Romeo alongside Kimi Raikkonen, but Ferrari is understood to want Antonio Giovinazzi to remain at the Swiss-based outfit another year.

Both Grosjean and Magnussen helped guide Haas to its best-ever finish in the constructors’ standings in 2018, finishing fifth ahead of McLaren.

The same year the pair recorded the team’s biggest race points haul, claiming 22 points with P4 and P5 at the Austrian Grand Prix.

“I want to extend my thanks to both Romain and Kevin for their hard work and commitment to Haas F1 Team over the past few seasons,” said team boss Steiner in a statement.

“Romain and Kevin played a significant part in that success. Of course, there is still plenty of racing left in the 2020 season.

“It’s been a challenging year, no doubt about that, but both drivers have given their all behind the wheel of the VF-20.

“We value their inputs and experience to keep pushing the team forward through to the Abu Dhabi Grand Prix in December.”