Mercedes executive director Toto Wolff has said Mercedes are already braced for a very difficult and complicated 2019 with fierce challenges expected from Ferrari and Red Bull.
"It's quite a complex psychological situation," the Mercedes boss told reporters after his team clinched the constructors' title at the Brazilian GP.
“The risk is you become complacent with winning - but I think this team has overcome this obstacle. But the job is going to get more difficult every year. We are setting the benchmark and our competition will get more energised and more motivated by us. You have to acknowledge the strength of the other teams and acknowledge that you could lose next year's championship and respect what they might achieve. All points start at zero next year, we'll have forgotten about the five and we'll fight hard to be in contention for the sixth. Whether we achieve it or not, we will see next year."
Mercedes have become only the second team in F1 history to clinch five consecutive double world titles-sealing every Drivers and Constructor's Championship since 2014.