The two teams had been banned from FOTA when they applied for applied for unconditional entry into the 2010 championship. FOTA members had not entered in protest at the proposed £40m budget cap being imposed by the FIA.
That proposal has now been replaced with an agreement to reduce costs to "mid-1990s levels", as FOTA sees fit.
New teams Campos Grand Prix, Manor and US F1 will also now become eligible for FOTA membership.
