Fernando Alonso has a secret agreement to join Ferrari for four years from 2011, Italian sports daily La Gazzetta dello Sport reported on Sunday.
The twice Formula One world champion has never hidden his desire to go to the Italian team and Ferrari president Luca di Montezemolo recently fuelled the ongoing speculation by refusing to rule out the Spaniard's future arrival.
The newspaper said the deal has several get-out clauses for both sides but added that Alonso could join Ferrari even earlier, in 2010, if 2007 world champion Kimi Raikkonen follows this year's disappointing season with another bad campaign.
By contrast, Alonso is in impressive form after returning to Renault following a difficult season at McLaren, despite not having a car competitive enough to challenge for the title.
The 27-year-old won two races, in Singapore and Japan, and finished fifth in the standings for Renault, with whom he won the 2005 and 2006 world championships.
Ferrari have Raikkonen and this year's title runner-up Felipe Massa under contract until the end of 2010, while Alonso's current deal with Renault also runs for two more seasons.
A Ferrari spokesman would not comment on the reports, apart from saying: "We can only repeat that we have two drivers signed to the end of 2010."