EU Trade Commissioner Valdis Dombrovskis declined to give an exact date for a decision on possible EU tariffs on Chinese electric vehicles on Thursday in Brussels.
"It's not decided yet," Dombrovskis said at a meeting of EU foreign ministers to discuss the European Union's trade policy. The investigation is "running its course," he said.
The European Commission officially launched an investigation into Chinese electric vehicles exported to the EU that may benefit from state subsidies that distort economic competition.
"The price of these cars is being artificially reduced by huge state subsidies, and this is distorting our market," Ursula von der Leyen, the commission's president, said to announce the probe.
The investigation can potentially lead to punitive duties being imposed on imports to the EU.
Dombrovskis stressed that provisional measures must be applied within nine months of the start of the investigation.
The German news magazine Der Spiegel, citing sources in the commission, reported that a decision would not be announced until after the European elections, which end on June 9.
The Chinese foreign office in Beijing has criticized the probe, charging that trade protectionism was behind the investigation.
Different efforts are currently under way in several EU economic sectors to reduce the bloc's dependence on imports from countries like China or Russia.