Haas drivers Romain Grosjean and Kevin Magnussen will leave the Formula One team at the end of the current season, the pair revealed on Thursday.
Their replacements have not been announced, but Haas have approached Russian Nikita Mazepin and his fellow Formula Two driver Mick Schumacher, the son of seven-time F1 world champion Michael, according to AFP.
"I would like to thank Romain and Kevin for their hard work and commitment to Haas over the past few seasons," said manager Guenther Steiner.
The decision comes on the eve of first practice for the Portuguese Grand Prix.
Denmark's Magnussen, who also had spells at McLaren and Renault, joined Haas in 2017 but has only scored one point so far this year.
"I am still working on my plans for the future, which I will announce in due course," the 28-year-old Magnussen said in a social media post.
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Glory for Hamilton
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He has repeatedly expressed an interest in racing in the IndyCar Series.
"I haven't won a race in seven years and that won't happen in 2021 if I continue in F1," he told Danish daily BT. "That's why I'm looking for new challenges in other categories."
The chances of Magnussen and Grosjean remaining in F1 appear bleak anyway, with the experienced pair of Sergio Perez and Nico Hulkenberg also currently without a 2021 seat.
"The last chapter is closed and the book is finished," said Frenchman Grosjean. "I've learned a lot, improved to be a better driver as well as a better man."
Grosjean, who claimed 10 podium finishes earlier in his career at Lotus, posted his first points of the season with a ninth-placed effort in the Eifel Grand Prix earlier this month.
