Mercedes Technical Manager James Allison has admitted that he is pleased with the current results but knows that they can't become complacent if they want to continue to dominate the sport. The Silver Arrows have had a recent spell of dominance over the rest of the grid.
Lewis Hamilton has won the championship in four of the past five seasons which underlines how much dominance the team have had in recent times.
"Yes, but we don't just have to fear Ferrari. Red Bull is also an extremely strong team," Allision told Autosport.
"We don't go into a single race with the confidence that we will win. It is clear to us that between today and Melbourne 2020 we have to make our car a lot faster if we want to have a chance against them. But this task is not meant to be easy. It is the ultimate challenge.