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McLaren Racing CEO Zak Brown has claimed Max Verstappen will walk out on his long-term Red Bull deal and join their rivals Mercedes.

Speculation has grown over Verstappen’s future as Red Bull will lose its Honda power unit supply at the end of the year and use their own designs instead from 2026. The team has already lost many of its top staff including chief technical officer Adrian Newey.

Verstappen signed his last Red Bull contract after winning his first championship with the team in 2021. That should keep him at his current team until 2028, but Brown believes he won’t see it out.

“I think he’ll leave at the end of this year,” he told The Telegraph. “Most likely to Merc.”

Earlier this year a newspaper report claimed Aston Martin was preparing to make a high-value offer to Verstappen to reunite him with both Honda and Newey.

“There’s been talk of Aston Martin, too, with Adrian Newey joining,” said Brown. “But as great as Adrian is – and he’s the greatest ever – you need a whole team around you. You need the culture. That takes time.

“If I was betting, I’d bet on Merc. In the last 10 years, they’ve won the championship seven or eight times. Last year they won five races. They have stability. We know Toto [Wolff] likes him. And I think we all feel HPP [Mercedes High Performance Powertrains] is best-equipped on the power unit side heading into the new engine regulations next year.”

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Brown also sees the potential for movement in Mercedes’ driver line-up for George Russell and Andrea Kimi Antonelli. “George is out of contract at the end of this season and Kimi will be on a series of one-years.”

Christian Horner, Zak Brown, Bahrain pre-season testing, 2025
There’s “no love lost” with Horner, says Brown

The McLaren team boss has clashed several times with his opposite number at Red Bull, Christian Horner, who called him a “prick” last year. Brown said the animosity between the pair is “genuine.”

“There’s no love lost there. I don’t like how he rolls and no doubt he feels the same about me.

“But I think it’s good for the sport. You need different characters. You need these rivalries. Some are friendly, sporting rivalries. Some are a bit more vicious. It’s always been like that.”

Verstappen’s driving has been a focus of Brown’s criticism at times, particularly following his clashes with McLaren driver Lando Norris last year. But Brown has also praised the four-times world champion’s ability.

In Las Vegas last year Verstappen challenged Brown over a widely-misquoted comment of his from six months earlier, claiming he could only win the title in the fastest car. Brown later said Verstappen “is not going to take a car that’s 15th and win in it [but] he might be able to take a car that’s third-quickest and win it.”

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Constructors’ champions McLaren have not been conservative with their car development for 2025, according to Zak Brown.

The McLaren Racing CEO said “there’s a lot of innovation” on the team’s new MCL39, which first ran at Silverstone two weeks ago.

“We definitely didn’t put it away after Abu Dhabi and polish it and just roll it out here,” said Brown. “It has a lot of innovation on it.”

Speaking during the first day of pre-season testing at the Bahrain International Circuit, Brown said the team was encouraged by the first signs from the MCL39.

“What I’m liking is the car is doing what we thought it would do,” he said. “Some of the innovations were bold so we needed to make sure they were going to work and not be issues.

“So we’re kind of ticking off the ‘yes that works’, ‘yes that’s going according to plan’. It’s way too early to see what the grid looks like but what we’re doing is getting through our run plan, it’s going according to plan, so I’m very happy with that.”

Four teams won multiple races last year. With a significant overhaul of F1’s technical regulations coming next year, Brown expects some teams to abandon work on their current cars early on. However he said McLaren are already hard at work on their 2026 car.

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“Probably, some teams maybe [won’t] put as much effort into ’25 because they don’t think they have a chance and therefore double down on ’26,” he said. “So that’ll be interesting to see what that looks like in ’26.

“Then you have ourselves and I’m sure many others [who are thinking] before we think about ’26, let’s make sure we optimise ’25 because we have a chance. So we are working on both.

“Our ’26 car has been in the wind tunnel, our ’25 car, they kind of bounce back and forth. So we’re working on both.

“Then I think we’ve got to see how we start the season, how much development do we think we have left and then kind of react accordingly as to how we balance our resources.”

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