Grosjean (left) and Magnussen have won a total of three points for Haas this season
Drivers Romain Grosjean and Kevin Magnussen will both leave Haas at the end of the 2020 season.
France's Grosjean, 34, has been with Haas since the team entered Formula 1 in 2016 while Dane Magnussen, 28, moved from Renault in 2017.
Valtteri Bottas won the most recent Australian Grand Prix in 2019
Australian Grand Prix organisers say they expect to host the 2021 Formula 1 season-opening race in its usual mid-March time slot.
This year's Melbourne race was cancelled after a McLaren team member tested positive for coronavirus.
Vietnam was preparing to hold its first ever Formula One Grand Prix in April
Organisers of the Vietnam Grand Prix have confirmed the cancellation of the country's first ever Formula One race due to the coronavirus pandemic.
The Grand Prix was originally scheduled for April, but had been postponed because of the Covid-19 outbreak.
Yuki Tsunoda came second in the Formula 2 Championship race in Sochi on 26 September
Japanese driver Yuki Tsunoda is to have his first Formula 1 test in an Alpha Tauri car at Imola on 4 November.
Tsunoda, a protege of Alpha Tauri's engine partner Honda, is a potential candidate for a race seat at the team next year.
Rossi is the only rider in history to win World Championships in 125cc, 250cc, 500cc and MotoGP
Valentino Rossi says he has tested positive for coronavirus and expects to miss the next two races of the MotoGP season.
The 41-year-old Italian is a nine-time world champion and 13th in this season's standings.
