It is obvious that the Spaniard's seventh win this season is a significant step toward the 2019 world title since it increased his points in the world standings to 275, 93 ahead of second-placed Andrea Dovizioso of Ducati.
"I want to thank Yamaha, Lin Jarvis and Maio Meregalli in particular for their trust in me, because the challenge is difficult: being competitive until I'm 40 years old," Rossi said.
The racers first used rain tyres before turning to the new ones they are to use in the upcoming season.
The main problem is that Formula One has never really taken off in Malaysia.
The 70-year-old had suffered a quad-bike crash in Ibiza last week.