The Russian Grand Prix and the first Tuscan Grand Prix have been added to the Formula One calendar for 2020.
The Mugello circuit, used in testing but best known for staging MotoGP races, will host its first F1 event on September 11-13, the weekend after the Italian Grand Prix at Monza.
Organisers say the race in Tuscany will mark the 1,000th outing for Ferrari, who own the circuit.
The Russian Grand Prix in Sochi will take place over September 25-27, taking the number of confirmed races for 2020 to 10. It is expected that at least a further five grands prix will be announced in the coming weeks.
"We want to thank the promoters, national authorities, the teams and the FIA for their hard work and support in making these grands prix possible," F1 said in a statement.
"Our fans will be delighted to see Russia host its seventh race at the Sochi Autodrom and see Formula One cars race for the first time at exciting Mugello circuit in Italy."
F1 chairman and CEO Chase Carey said: "We had a great start to our season in Austria last weekend and we are increasingly confident in our plans to race throughout the remainder of 2020.
"The Russian Grand Prix is a major moment in our season and we are looking forward to being back in Sochi in September. We are equally excited to see Formula One race for the first time at Mugello, an occasion that will mark Ferrari's 1,000th grand prix.
"Both races will be a huge boost for fans with more announcements on the next races in our calendar coming in the weeks ahead."
Ferrari's Sebastian Vettel described the Mugello circuit as "one of the favourite tracks for all drivers" when the Scuderia were testing at the venue last month.
"Should we come here to have a grand prix this year, that would be great," he said.
