Ferrari will announce its driver choice for 2019 on Thursday.
At Monza, it was rumoured that after extended internal wrangling, Kimi Raikkonen had been told he will be replaced by Charles Leclerc next year.
Vettel not a happy chap
It might explain why Raikkonen was suddenly arguably uncooperative on-track, receiving a slipstream from Sebastian Vettel in qualifying and then racing hard a day later.
READ: Ferrari 'needs time' for Raikkonen decision
"It is clear to me that I must now compete against three cars, including my own teammate," Dutch broadcaster Ziggo Sport quoted a disgruntled Vettel as saying.
The German added: "I do not expect any help from anyone."
Sky Italia claims that Raikkonen's impending exit will soon become public, with a meeting at Maranello scheduled for Thursday to formalise it.
But Corriere dello Sport claims that the 38-year-old already knows his fate, following a call from new Ferrari chairman John Elkann.
However, Raikkonen's fellow Finn Mika Salo cannot understand why Raikkonen did not immediately announce that news to the world when Elkann told him at Monza.
"I would have expected Kimi to say it himself after Monza, but it didn't happen," the former F1 driver told Iltalehti.