The world of Formula 1 could know by the end of next week if the 2020 season will get up and running in July.
Red Bull, the Red Bull Ring in Spielberg, and Formula 1 have applied to relevant authorities in Austria for approval for back-to-back 'ghost races' in early to mid July.
He added that there will then be enough time to make any adjustments suggested by the government to comply with safety requirements during the corona crisis.
F1 is targeting an up to 19-race calendar between July and December.
Marko said: "I can imagine that we will have about 10 to 15 races, provided the two opening races can be carried out as planned in Austria.
"That would be absolutely enough for the world championship, but it will require a lot of flexibility from everyone involved."
The disparity between F1's planned 19 races and the 10-15 expected by Marko is because several countries on the proposed calendar may not take place.
The US F1 GP, for instance, is under a cloud after Austin health official Dr Mark Escott told the American Statesman newspaper that "large events" will be "the last thing we're going to turn back on".
"Looking through the end of December, we don't have any indications at this stage that we would be able to mitigate risk enough to have large events," he said.
Marko, though, thinks the time has come for the world to re-open.
"The situation is gradually improving, bringing us closer to the beginning of the season," he said.
"Safety and health are of the utmost importance, but I believe that it is time to return to a normal life, with sports and spectators."
Meanwhile, Marko does not think Formula 1 itself is at risk of collapse due to the global restrictions.
"Formula 1 will survive," he said. "People crave sport, they want to be entertained - they need the thrill that a Formula 1 race can offer."
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