Ferrari manager Maurizio Arrivabene affirmed at the German Grand Prix in Hockenheim that the pair always worked together on strategy.
SGS, the Swiss logistics services company, also announced on Sunday that it had named a new acting chairman to take over for Marchionne, since his illness prevented him from fulfilling the role's obligations. Ferrari's Board named Elkann as new Chairman to replace Marchionne.
Ferrari leads the drivers' and constructors' championship this year and could end four years of Mercedes dominance. He's been heading the Jeep brand since 2009 and has also been running RAM and FCA in the Asia Pacific region. "Marchionne increasingly had it tuned to perfection", Galliers said. Last Saturday, FCA's PR department stated his health does not allow him to resume his tasks.
CNH manufactures farm equipment, trucks, buses and other vehicles.
Fiat is considered a close-knit family, and FCA chairman John Elkann said he was "profoundly saddened to learn of Sergio's state of health".
The luxury carmaker said Louis Camilleri, a Ferrari board member and chairman of Philip Morris International Inc., will become CEO.
Marchionne, a 66-year-old Italian-Canadian, joined Fiat in 2004 and led the Turin-based company's merger with bankrupt US carmaker Chrysler.
Marchionne's tenure also has been controversial at times.
Shares in Fiat Chrysler Automobiles have dropped 4 percent in the first trading since news that the Italian-American automaker's longtime CEO, Sergio Marchionne, has been replaced unexpectedly due to complications from surgery.
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No announcement was made on auto tariffs, and it was not clear whether any progress had been made on resolving the issue. After emerging from the White House , he described his talk with Mr Trump as a "good and constructive meeting".
The 66-year-old Marchionne recently negotiated a budget cap with F1's powerbrokers, FIA president Jean Todt and Liberty Media's top F1 executive, Chase Carey.
He resisted the comparatively easy option of selling off coveted brands such as Jeep, saying that would leave too big a problem with Fiat as 'the stump that is left behind'.
"In our view, Mr. Marchionne's industry thinking can not be overstated", Houchois said.
Over 14 years at the helm of what's now Fiat Chrysler Automobiles NV, Chief Executive Officer Sergio Marchionne transformed a middling European carmaker into a global giant.
Marchionne engineered both the turnarounds of Italian carmaker Fiat, which he took over in 2004, and Chrysler, which Fiat acquired in 2009 in a deal with the US government, creating the world's seventh-largest carmaker out of two formerly dysfunctional entities.
"The Board resolved to accelerate the CEO transition process that has been proceeding over the past months".
Altavilla, 54, was a close aide to Marchionne, having overseen Fiat Chrysler operations across the globe. The Board will therefore propose to the next Shareholder Meeting, to be called in the coming days, that he be elected to the Board and serve as an executive director of the Company.
The La Stampa daily, the hometown newspaper of Fiat's headquarters city, Turin, where the boards were summoned to separate meetings, said the huddles were called to discuss who would succeed Marchionne. Marchionne has stated in the past his desire to step down as FCA CEO sometime in 2019.