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The PM's official spokesman insisted the government 'would not countenance' a downgrading of the six-days-a-week letter service despite the firm arguing it is 'not sustainable'.
The firm has previously said it is not sustainable to continue delivering letters six days a week.
A consultation paper to be published by Ofcom next week will outline radical options for reforming Royal Mail's Universal Service Obligation, Sky News learns.
Royal Mail has previously said it wants to deliver five days a week, from Monday to Friday only.
Ofcom is to lay down options next week to reform Royal Mail's service obligations - which could make it easier for the company to axe Saturday postal services.