Jenson Button insists Honda can replicate Ferrari's remarkable 2015 turnaround in time for next season's opener in Melbourne.
McLaren's return to Honda power delivered the team's worst result since 1980 as it struggled with the uncompetitive and unreliable power unit. Honda is confident it knows the areas it needs to improve this winter before testing begins at the end of February.
By contrast, this year saw Ferrari bounce back from a winless 2014 season in style, claiming three victories through Sebastian Vettel as it emerged as Mercedes' closest challenger. It now heads into 2016 hoping to cut the gap enough to challenge over the course of an entire season and Button thinks it is realistic to think Honda can replicate the same sort of turnaround.
"It was great to see [Ferrari] pick up the pace," Button said. "I heard rumours they found a hundred horsepower over the winter. I don't know if that's true or not. But whatever they found, it was massive and they took the fight to Mercedes on many occasions. It was good to see.
"Obviously we need to make even bigger steps if we want to achieve that, but it can be done over a winter."
Button does not think there are any issues with the McLaren-Honda partnership, saying both sides took the blame when things went wrong in 2015.
"I think there are always issues on both sides, but I don't think Honda get blamed for everything, I don't think that at all. We had a lot of issues this year. We've got to resolve them as quick as possible because next season is not far away. It's going to be a long, hard winter for us, but an exciting one as well, as there is a lot coming."