The sources said that there would be no decision before July 4 when the provisional duties take effect.
They declined to be identified because the information is confidential.
The companies did not immediately respond to a request for comment.
A spokeswoman for Dacia, Renault's low-cost brand (RENA.PA) whose electric Spring is imported from China, said that an announcement on its price was "not on the agenda". It will be subject to a 21% duty.
WHY IT'S IMPORTANT
Tesla is the only carmaker to announce plans to increase prices - on its Model 3 - to compensate for the higher cost at European borders as a result of the tariffs.
Analysts expect other manufacturers producing in China will pass on part of the extra cost to consumers.
CONTEXT
Last week, the European Commission proposed tariffs of up to 38.1% on EV imports from China despite Beijing's protests, plunging trade ties to a new low and risking punitive action from the world's second-largest economy.
MG faces tariffs of 38.1%, on top of the current 10% tariff, while for BYD the new tariffs amount to 17.4%.
