Although clearly the most likely team to win the constructors' championship, Red Bull's dominance over teams like McLaren seems to have dissipated for now, with Brown seeing drivers Norris and Oscar Piastri regularly on the podium.
McLaren have used Mercedes power units since 2021, having previously been partnered with the German manufacturer between 1995 and 2014.
However, 2026 sees a unique overhaul of the sport's rules, with power units becoming more environmentally friendly and featuring an increased reliance on battery power.
2026 is also the year Red Bull will ditch their partnership with Honda, and instead produce their own power units, with the help of Ford.
The German publication also reported Brown as quoting he had held a meeting at the world champions' Milton Keynes-based HQ, before McLaren's current deal with Mercedes was signed.
"I have a great relationship with Jim Farley [Ford CEO]," Brown said, as quoted by Auto Motor und Sport.
"We met last year and then visited the factory. That was before we decided to extend our contract with Mercedes."