Races in Australia, Bahrain, Vietnam, China, the Netherlands, Spain, Monaco and Azerbaijan have all been cancelled or postponed so far
The organiser of the Canadian Grand Prix says there are about three weeks before a decision has to be made whether to postpone the race.
The event, on 14 June, is the first on the original schedule not yet postponed in the wake of the coronavirus crisis.
Lewis Hamilton won the 2019 F1 drivers' championship with Mercedes
Formula 1 bosses have agreed to delay the planned 2021 rules until 2022 and to work to squeeze as many races into this season as possible.
The moves are a response to the coronavirus crisis, which has thrown the new season into disarray.
The Australian Grand Prix was cancelled after the McLaren staff member tested positive for the virus
Seven McLaren team members who were tested for coronavirus following the abandoned Australian Grand Prix have returned negative results.
The staff took the test because they had showed symptoms after close contact with a team member who returned a positive test in Melbourne on 12 March.
Lewis Hamilton is chasing a record equally seventh drivers championship' this season
Formula 1's summer break has been moved forward from August as a result of the coronavirus pandemic.
The new season has been thrown into disarray by the virus and F1 is working on plans to run as long a season as possible once races can be held.
The opening four races of the 2020 Formula 1 season have all been cancelled
The Ferrari Formula 1 team have all gone into self-isolation since their return from the Australian Grand Prix - some in hotels paid for by the company.
The move is a precaution - no member of the team have so far had any symptoms of the coronavirus, Ferrari said.
