Jenson Button believes there is a lot more to come from Sergio Perez and he believes working with McLaren will be the makings of him.
Perez will take over from Lewis Hamilton, who has gone to Mercedes, and much is expected of the Mexican after an impressive season with Sauber.
Button, in particular, was impressed with how his new team-mate performed and he is confident McLaren will bring out the best in him.
Speaking at the launch of the new McLaren MP4-28, Button said: "The positives definitely for me were in a very difficult race in Malaysia.
"Obviously he had a fantastic result finishing second and so close to the victory - I'm sure he still thinks about that moment right now - but also in Monza; I wasn't in the race at the end so I was able to watch Checo come through the field and chase down Lewis at the end so two really, really good races and races that he should be very proud of.
"But then, obviously you had the other race in Suzuka with Lewis, which was a great fight again but it obviously came off the other way.
"But that's racing; you have good races when you're talented and of course you're going to have bad races, there's always going to be a balance, but I think for the consistency through the year was very good in terms of the results and the results that should have come but didn't as well.
"So there's a lot more I'm sure we'll see from Checo in the next few years and improvements in working with McLaren - a team that's achieved so much - it really does bring the best out of you."
Like Button, McLaren team principal Martin Whitmarsh has been impressed with Perez and he is hoping the two drivers can push each other in the right direction.
"Inevitably if both drivers have got similar needs then for the engineering team in terms of developing the car, not so much over a race weekend but over the course of the year, it makes life easier than if we have to be diverging all the time," Whitmarsh said.
"In truth we don't know yet and with Checo it's fairly early days, but one would imagine we can develop the car in harmony and that makes it more efficient for us. Over the course of the race weekend, their assessment of tyre wear and their feelings on tyre strategy we don't know yet and we will find that out in Australia."