An announcement is expected prior to this weekend's second race in Austria, the Styrian GP.
It will conclude F1's third triple-header to open this season, and will follow on from the Belgian and Italian Grands Prix the two weekends previously.
It is understood there will then be a free weekend, with the Russian Grand Prix at the Sochi Autodrom to take place on its original date of September 25-27, with the Portuguese GP a week later.
A Middle East triple-header will conclude the campaign, with Bahrain staging two races, expected to be November 29 and December 6, with the final race of the season - as per its contractual obligations - on December 13.
The races in between Portugal and Bahrain have proven more complex for F1 to finalise, notably due to the Covid-19 issues in the United States and Brazil.
With F1 eager to lock in events to ensure teams, partners and promoters can start planning the logistics of their races as far in advance as possible, it is now appearing likely there will be a Far East double-header.
China is almost certain to get the green light, followed by an inaugural race in Vietnam, although discussions remain ongoing, similarly with regard to the prospect of a race in Canada.
At this stage, the calendar is guaranteed a minimum of 14 races, with the possibility of it stretching to 18 if the talks currently taking place conclude favourably.
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