It is ‘not a total impossibility’ that Carlos Sainz quits Ferrari for Sauber ahead of Stake F1 Team becoming the works Audi entry as his contract negotiations are still ongoing. The Scuderia moved to lock Charles Leclerc up with a new contract last week. It tied the 26-year-old down until, at least, the end of the 2025 season. But Sainz faces an uncertain future in Maranello, as Ferrari are still yet to extend the 29-year-old’s stay beyond the 2024 season. Now, Sky Sports reports that Sainz may even leave Ferrari when his contract expires to sign with Sauber. The Hinwil, Switzerland-based outf…