Two sources in Brussels told Reuters, Censor.NET reports.
The proposed additions to the blacklist could include Russian energy ministry officials and the Russian company that moved the turbines to the Black Sea peninsula, one senior diplomatic source said.
Another source said representatives of all 28 EU member states could discuss the matter for the first time in Brussels as soon as Wednesday.
The EU needs unanimity to impose or extend any sanctions.
Siemens says it has evidence that all four turbines it delivered for a project in southern Russia had been illegally moved to Crimea.
In early July, Germany's Siemens said it had set up a task force to investigate reports that its turbines had been delivered to Crimea for use in Russian-built power plants.
Related materials: Sanctions against Russia