In the meantime, organisers are almost completely ready for the FIA's final circuit inspection next week.
Russian GP chief Sergei Vorobyov told the Ria Novosti news agency that the FIA delegation will carry out the inspection next Tuesday.
"As you have seen," he said, "except for the final cosmetic work - painting, cleaning, equipment installation - the circuit is ready for the grand prix," he said.
"On August 19 the FIA will come here to decide on the acceptance of the facility for formula one," Vorobyov added.
The 2014 Russian grand prix is scheduled for October 12.