Formula 1 has called off the US, Mexican and Brazilian Grands Prix this year as a result of the coronavirus crisis in the Americas.
With infection rates rising in the three countries, F1 bosses believe it would be irresponsible to hold races there.
Instead, three further races in Europe are to be added to the calendar.
These will see a return for Germany’s Nurburgring and Imola in Italy, and an F1 debut for Portugal’s Portimao track.
The US Grand Prix in Austin, Texas, had been due to be held on 23 October, with the Mexican race in Mexico City a week later and Brazil on 13 November.
But F1 officials have accepted that it will be impossible to hold the races.
Any hopes of reviving the Canadian race, originally scheduled for June and postponed in April, have also been abandoned.
The coronavirus has a much lower prevalence in Canada, but the country has local restrictions and travel rules that make impossible to hold a race.
An F1 statement said: “Due to the fluid nature of the ongoing Covid-19 pandemic, local restrictions and the importance of keeping communities and our colleagues safe, it will not be possible to race in Brazil, USA, Mexico and Canada this season.”
The grand prix at the Nurburgring, which last hosted a race in 2013, will be held on 11 October, when it will be vulnerable to bad weather.
The date is the latest in the year a grand prix has ever been held on the historic track in the Eifel mountains, where snow has been known to fall even in the summer, and certainly cannot be ruled out in October.
Portimao, on the Algarve, will follow on 25 October, with Imola on 1 November. Imola will be a two-day event, meaning there will be no Friday practice.
Imola has long, historic connections with F1. It replaced Monza as the home of the Italian Grand Prix in 1980 and had a permanent home on the calendar as the San Marino Grand Prix from 1981 to 2006.
It is also notorious as the track on which Ayrton Senna and Roland Ratzenberger were killed on consecutive days in 1994.
Portimao is to be one of the first races to allow sp