By
"From that market test we got a very broad response, a very nuanced response and but also to some degree a critical response," Vestager told a news conference in Brussels.
"On the basis of that, we are back with Gazprom to address some of the things that were commented in a critical way in the market test," she added.
The European Commission wants Russian gas giant Gazprom to make more concessions in order to end a six-year long antitrust investigation, the supervisor said in October.