Haas have retained their young driver line-up for the 2018 season, with Santino Ferrucci and Arjun Maini continuing in their development roles.
Both drivers will be team-mates at Team Trident this season in Formula 2 as they look to continue on their path towards Formula 1.
Haas team boss Guenther Steiner said: "Arjun enjoyed a breakout season in GP3 last year and we're keeping a close watch on his progress this year in F2.
"He has a history of finding success at every level in which he's competed and we're supportive of his efforts as he steps up to F2."
On Ferrucci, Steiner added: "We're pleased to have Santino back with Haas F1 Team and we look forward to his continuing development in F2.
"Santino is a young, American driver with plenty of potential and we're very supportive of his desire to make it to Formula One."