"The South Stream is not a Bulgarian project, and the whole project does not depend on us," Bulgaria's Prime Minister wrote on Facebook.
He also added Sofia might be forced to make amendments in sections disapproved by the EU Commission.
Plamen Oresharski reminded the country had received "remarks" from the European Commission which prompted him to order that all activities, mostly those involving the signing of new agreements, be halted until the issue "how well-grounded these remarks are" is settled with the Commission.
An infringement procedure over the construction of South Stream has been reportedly in place since early June, though Sofia has long complained no documents from Brussels were received on that matter.
The EU Commission has expressed concerns that activities related to the pipeline's construction in Bulgaria violate the bloc's rules.
It points at issues of competition arising in the tender launched to build South Stream, after which the company Stroytransgaz was commissioned to become the main subcontractor.
The Commission is also worried by legislative amendments adopted at first reading in Bulgaria's Parliament in spring that might exclude South Stream from the Third Energy Package and prevent "third-party" access to its pipes.