Factory Yamaha's Valentino Rossi believes the next two MotoGP rounds at Sachsenring and Laguna Seca are important in terms of confirming the setup changes which enabled him to win at Assen will continue through the season.

The Doctor made adjustments to his forks and bike weight distribution at a Motorland Aragon test which then transferred successfully to the last race in Holland but now Rossi needs to find out whether it was just a one off.

"I'm going to Sachsenring with a new spirit. I am very happy for the Holland race. Now I want to keep it going like that. We also want to confirm at Sachsenring the step we’ve made with the bike," said Rossi.

"We must continue to improve the bike, as we have done after testing at Aragon, because now we want to try to fight for important positions. We want to stay with the top guys every weekend. I really like Sachsenring and then there will be Laguna Seca. These will be two very important weekends.”