The duo are to take part in a test at the Scuderia's privately-owned Fiorano track towards the end of June, understood to be the week commencing the 22nd, using an F1 car that is at least two years old, as per the regulations.
The test is designed to shake off any 'rust' Vettel and Leclerc may be experiencing after what will have been almost four months of inactivity, aside from using their home simulators.
Mercedes has already confirmed reigning six-time champion Lewis Hamilton and Valtteri Bottas will test this week at Silverstone, with the Briton in the 2018 W09 on Wednesday, and the Finn driving the day before.
The test will also help Ferrari familiarise itself with the procedures required regarding social distancing and health checks that will be in place for the recently announced opening eight races of the season around Europe.