The Austrian said: "The most adaptable and agile team will come out on top this season".
Speaking ahead of this weekend's season opener in Melbourne, the Briton continues to insist that his Maranello rivals have the edge.
"What we see from testing, we think [we are underdogs]", Bottas told reporters in Melbourne.
However, Rosberg admits that Vettel needs to drive a "perfect season" from the cockpit, and fend off the challenge of his new teammate Charles Leclerc. The 29-year-old Finn is now entering his third year with the world champions and says it is time to be more selfish in order to achieve his career goal of winning the world championship.
2 - Reigning world champion Hamilton has finished in second place in his last three races in Australia; only in Valencia (European GP) has he finished runner-up on as many consecutive occasions (2008-10).
"I've got great memories of this track". Another former F1 driver, Ralf Schumacher, says the "biggest mistake" made by Ferrari previous year was not giving Vettel "everything he wanted".
Hamilton laps up crowd's cheers at F1 season launch party in Melbourne
"As in any team there has to be a number one and a number two in a 50-50 situation".
Max Verstappen, who at 17 was the youngest driver ever to start a race, is now a 21-year-old "veteran" in his fifth season and the main man at Red Bull, who also have 23-year-old Frenchman Pierre Gasly racing for them.
The team said on Tuesday it had expedited an upgrade for the RB15 vehicle in time for Sunday's race, a month earlier than scheduled.
"It'll be interesting to see how Red Bull's upgrade worked and I know Ferrari usually bring an upgrade to the first race so it will be interesting to see". The Pole has confessed that he is not a 100% ready for his F1 return, 20% at best, to say the least.
It will also be an emotional weekend for Pole Robert Kubica, who reboots his F1 career with the struggling Williams team eight years after being seriously injured in a rally auto accident.
"Over the winter some things have been different, like with my coach again we looked through the travel plan and everything, all the details that we think is going to be best for my performance, like where I am between races, where do I fly, when do I fly".