A suggestion had been aired that with the teams due to run the rule over Pirelli's new specification of tyre to be used from the Hungarian Grand Prix onwards that an extra day be allowed.
The Italian manufacturer, due to the blowouts that occurred during the British Grand Prix, are to introduce a tyre that comprises last year's construction with this year's hard, medium and soft compounds.
The FIA, however, has confirmed the test will still take place from July 17-19 at Silverstone, with race drivers also now allowed to take part, but only for the purposes of testing the new Pirelli rubber.
To that effect, a statement from the FIA read: "In order to meet this requirement, all teams shall ensure that any changes made to a car at these times are exclusively related to the tyre tests set out in the run plan provided by Pirelli.
"An FIA observer will be appointed to ensure the regulations are being followed."
Ten of the 11 teams are involved, with the exception of Mercedes who are banned from the event after being found guilty of conducting an illegal tyre test with Pirelli in Barcelona in mid-May.
Mercedes had hoped to still take part if the test had been extended to a fourth day, given their ban was for three days, but that option has now been removed.
With the new tyres being introduced on safety grounds, however, the Brackley-based marque's only argument now is it would be unwise for them to head into an event with no running.