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Sebastian Vettel will not be given an early release from his Red Bull Formula 1 contract so he can test for Ferrari in the Abu Dhabi post-season test.

The four-time F1 world champion is due to be confirmed imminently as Fernando Alonso's replacement at Ferrari for 2015.

Although it was possible Vettel could have gained a first experience of Ferrari in the test that takes place at Yas Marina after the 2014 season finale, such a plan has been blocked by his Red Bull chiefs.

Speaking at last weekend's Russian Grand Prix, Red Bull owner Dietrich Mateschitz said that his team would hold Vettel to the full terms of his contract - which runs until five days after the Abu Dhabi Grand Prix.

"Only after that will he become a free agent," Mateschitz said.

Mateschitz also made it clear that Vettel would be frozen out of any information relating to Red Bull's 2015 plans, so he cannot take secrets to Ferrari.

"Sebastian will be totally equally treated and get the same material as Daniel [Ricciardo] in the final races," he explained.

"However, he will not get any information on our developments for 2015."