UPDATE: Suzuki confirm to Crash.net that they have given Maverick Vinales permission to test for Yamaha at both Valencia and Sepang in November.

MotoGP champion Jorge Lorenzo has admitted Yamaha doesn't seem keen to allow him to take part in two tests for Ducati in November.

Having spent all of his premier-class career with Yamaha, claiming 43 wins and 3 world titles, the Spaniard will start a new challenge with the Italian factory next season.

But since MotoGP rider contracts run until the end of December, Lorenzo needs permission from Yamaha to take part in both an official test after the Valencia finale, plus a private test at Jerez.

Honda famously refused to allow Valentino Rossi to test for Yamaha until his contract had expired at the end of 2003. But since then no rider has been refused.

The difference in this case is the inclusion of a second test later in November. Prior to last year, riders only wanted permission for Valencia and - due to testing restrictions - wouldn't ride again until Sepang in February.

Yamaha seems open to allowing Lorenzo to make his Ducati debut at the Valencia test - although even that is not yet official - but less keen on Jerez as well.

"Well obviously I would like to make the Jerez test, but it is not a thing that depends on myself," Lorenzo said at Motegi on Thursday. "For the moment, looks like I will test in Valencia - even if I'm still to receive authorisation to do it. Looks like for Jerez, Yamaha is not so keen to permit that.

"We'll see what happens. I think that for the years we've spent together, I deserve it and for the things we've won together. But obviously it doesn't depend on myself and I will respect whatever decision Yamaha will make, because I am a Yamaha rider."

Lorenzo will be replaced by Maverick Vinales, who will require permission from Suzuki to test for Yamaha at Valencia and Sepang - Yamaha choosing the Malaysian venue instead of Jerez.

Should Vinales take part in two November tests, it will be difficult for Yamaha to refuse the same for Lorenzo...