Fernando Alonso looks set to leave Ferrari at the end of this season despite still being under contract at the team.

The double world champion's future has been the centre of speculation for a number of weeks, with McLaren courting his services as it moves to Honda power units from 2015. A change of management at Ferrari - Stefano Domenicali was replaced as team principal by Marco Mattiacci in April and Luca di Montezemolo is poised to leave as president - has only served to fuel those rumours, with Alonso increasingly impatient over a lack of success.

Sources confirmed to Crash.net that it appears the end of the road has been reached after five years, despite Alonso having two years left to run on his contract. Alonso - at the age of 33 - is eager for immediate success while Ferrari prefers a younger team leader to return it to the front in a similar way that Michael Schumacher did in the late 1990s.

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While previously there have been financial considerations, it is understood that both Ferrari and Alonso are now agreed on the nature of the split. However, any announcement about Alonso's future is unlikely to be made until after Montezemolo officially leaves his position as president, with Sergio Marchionne taking over duties following the Russian Grand Prix on October 13.

Ferrari is keen to secure Sebastian Vettel as Alonso's replacement - with the four-time world champion still under contract until the end of 2015 at Red Bull - but a swap deal appears unlikely with McLaren the team that is most actively pursuing Alonso. Red Bull has been impressed with Daniel Ricciardo following his step up from Toro Rosso and is understood to be open to promoting Daniil Kvyat if Vettel were to leave.

If Ferrari is unable to secure Vettel next season, Jules Bianchi would be in line for a promotion from Marussia to partner Kimi Raikkonen, while Romain Grosjean also believes he's in with a chance of the seat.

When it was put to Grosjean that he called Alonso the key to the driver market earlier this season, Grosjean replied: "I was right!

"I'm not the key unfortunately. It could [unlock doors], but as I say we need to wait for what Fernando does. If he moves things may completely turn, positions may swap, it could be just one, I don't know..."