After Sunday's success, Verstappen was seen celebrating with Marko.
Max Verstappen won his first world title, but Red Bull adviser Helmut Marko thinks he can still get better.
"He is a driver who I'm sure is not at the end of his abilities," said Marko, an ex-Formula 1 driver.
He had a good performance in the last two races. He did a lot more than the car could do.
We don't believe we have seen the end of Max Verstappen. The more he wins, the more relaxed he gets.
Red Bull signed Verstappen for its F1 programme before he had even driven an F1 car, as the right-hand man of co-owner Dietrich Mateschitz.
He gave Verstappen his first chance to drive a car on a grand prix weekend, just five days before his 17th birthday.
Verstappen was the youngest driver to start a full F1 season. He became F1's youngest grand prix winner when he won on his debut for Red Bull.
When he was 15, he had the first serious discussion with me. I saw him in a race and he was better than everyone else.
I had a discussion with him after he won the race and I was surprised that he was in a very young body.
He knew what he wanted to do.
We decided to go into Formula 1 after talking about the future for a couple of weeks.
Verstappen had developed a lot over the seven years he had been in the business, according to Marko.
He learned quickly. He was controlling more and more, according to Marko.
He can be stubborn. He matured without losing his strength.
His personality is getting even more strong, as he was already young.
He goes his own way. He looks right and left. He doesn't worry about all this media stuff. It's nice to see a young man focused on his job.
The first world championship is done. We will work hard to get the next one and I'm sure it's not the last world championship.
You have to accept it if you lose.
The Mercedes team principal was upset by the way the rules were applied.
Verstappen won the title in controversial circumstances in the last race.
Lewis Hamilton, who had dominated the race and was on course for the title himself, was exposed to old tires after Verstappen had made his first pit stop.
Verstappen passed Hamilton on the last lap to win the title and Mercedes believed they were against the rules.
Mercedes will appeal against a decision by race stewards to reject their post-race protest regarding the handling of events by race director Michael Masi.
He said he understood why Mercedes were upset.
He said that they had the ability to go to the pits. They did not. It was their mistake.
It would have meant losing the lead to Verstappen, which Red Bull would have almost certainly left out on the track.
If Hamilton had to overtake, the title would go to Verstappen, and Mercedes knew that if the two drivers crashed, it would be Verstappen.
To influence Michael Masi, the race director, not to give a safety car. That's not what they are good at.
They showed up with a high-paid barrister to the last race, which was really disappointing.
The best engineers are taken to the race to get the maximum out of the car. The way they acted after the race is not understandable.
They believed until one lap from the end that they would be accepted. You have to accept it if you lose.
