The seven-time MotoGP champion goes into this weekend's race at Le Mans in France with a 15-point lead in the championship over Andrea Dovizioso, despite a disappointing race in Andalucia last time around which his team-mate Jorge Lorenzo won.
Nevertheless, Rossi is in confident mood ahead of this weekend's race following an impressive test on Monday.
"I'm very happy about Monday because it was a very good test for me," said Rossi during the pre-race press conference in France.
"First of all we had some small part to improve the M1. Everything worked quite well. It was nothing very big just some details. But small details that improve the performance.
"Especially I was happy because we improve a lot the setting. I think in the race we weren't ready to give the maximum. On Monday we work a lot, we make a lot of lap and in the end I was fast."
Rossi admitted that Le Mans isn't one of his favourite tracks on the MotoGP calendar, but after finishing in second place last year with a less competitive bike, the Italian expects to be challenging at the front of the grid this time around.
"It's not one of my best three of four tracks during the season but I like. It's always a difficult track. The weather is always an issue because in the morning it's always very cold. The afternoon is a little bit better but the temperature is very low," he said.
"So it's difficult to ride the bike and also you have to use soft tyres for have good grip. Last year was a great weekend. There was always the sun and in every practice we work to arrive ready for the race. We hope also this year the weather will be good.
"Jorge started the season with some difficult race but his performance in Jerez was fantastic because he was always faster from Friday to Sunday. This means it will be very hard to arrive in front of him for the championship. Usually Jorge is always very fast in this track that is historically a good track for the Yamaha.
"We have to understand the level. Last year was a good weekend. But last year Marc was always the faster, always very strong in braking and entry, and was able to do better lap times."