John Elkann told reporters in Turin on Thursday that the Italian American company would fight the lawsuit in court, adding "we are not worried."
GM has accused Fiat Chrysler in a lawsuit filed at a U.S. district court on Wednesday of bribing union officials to get favorable contract terms from the United Auto Workers Union.
Elkann, speaking ahead of an investor-day event for the Exor investment arm that controls FCA, was quoted by Italian news agency ANSA as saying there would be a memorandum of understanding with PSA by the end of the year, as previously announced.
FCA said the lawsuit is "meritless."
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