Earlier, Marchionne has spoken about setting up a satellite Ferrari team, perhaps to be branded as Alfa Romeo.
"It would be quite useful for Sauber to have someone like Leclerc as a driver," Speed Week quotes the Frenchman as saying.
Indeed, Monaco-born Leclerc impressed when testing the 2017 Ferrari in Hungary recently, and both the 19-year-old and Giovinazzi have subsequently been in action to help Pirelli with 2018 tyre testing in Barcelona.
Leclerc was quoted by Italy's Autosprint as saying afterwards: "I feel ready for formula one."
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