MotoGP title leaders Valentino Rossi and Jorge Lorenzo will try a new Yamaha chassis during Thursday practice at Assen.

The chassis performed well in a recent private test at Aragon, specifically helping corner entry.

Movistar Yamaha have told that Rossi and Lorenzo will now each have one of the new designs available for the Dutch TT weekend.

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Speaking at Assen on Wednesday evening, Rossi said: "We tried a new frame at Aragon. The plan was to try the new frame at two different tracks - Barcelona and Aragon - and Barcelona would have been really important to compare back-to-back with the race on Sunday.

"Unfortunately the weather was very bad in Barcelona on Monday, so we tried the frame only at Aragon. But the feeling is good and we will try also tomorrow. During practice we have to understand if in reality it is better or not."

Rossi currently leads Lorenzo by just one-point after the Spaniard won the past four races in a row.

Reigning MotoGP champion Marc Marquez is due to try last year's Honda chassis at Assen, as he seeks to improve the rear grip characteristics of his RCV.