The Woking outfit has expanded its racing operations considerably in recent years after fresh investment over the previous two years, starting with it taking a majority shareholding in the Schmidt Peterson Racing IndyCar team ahead of the 2020 season - which now races as Arrow McLaren.
It has also diversified its interests by extending its reach into electric racing, setting up an Extreme E team prior to its purchase of the title-winning Mercedes Formula E team ahead of the 2022-23 season.
In a roundtable at the Mexico City E-Prix with selected media, Brown says the focus is now on ensuring that each team is self-sufficient through results and reach for potential partners.
Asked by Motorsport.com if there was the prospect of further growth into other categories, Brown added that although McLaren continues to do its due diligence on the prospect of a WEC entry, it would need to balance with the current teams it has.
"Yeah, we're very busy with the portfolio that we have. The other series that I've spoken about that we continue to look at, and that's exciting for us, is the World Endurance Championship," he said.
"We won on our debut there in 1995 [at the Le Mans 24 Hours with the F1 GTR], but I think we need to make sure we continue to progress in Formula 1.
"We've expanded now to three cars in IndyCar on a full-time basis. We've just had our first year in Extreme E, which was successful for us, and we achieved a podium [at Punta del Este]. And now here we are in Mexico for our first Formula E race.
"I would say WEC continues to be under review, but nothing there is imminent because we need to make sure that each team's self-sufficient, both from a people resources and partnership point of view.
"And we need to make sure that anything else that we bring on doesn't disrupt what we. That's the long answer - WEC would be something that continues to interest us, but we're not ready for it quite yet."
Brown added that F1's budget cap was key to ensuring that McLaren could expand its racing operations into other series, and says without the notion of a cap on spending, it would not have been able to sanction its growth into other championships.
He explained that Formula E's own budget cap, which is approximately €13 million per year between 2022 and 2024, was also valuable in enticing McLaren to the all-electric championship.
"First and foremost, being a Formula 1 team, until we felt we got our Formula 1 team in a better place and a budget cap to be part of that, we weren't going to be in a position to take on an IndyCar team, or Extreme E or Formula E.
"So I would say the budget cap is critical in Formula 1. I think it's critical in Formula E, and that was something that was also very appealing to us, was that we knew we could come in and we could run at the budget cap.
"IndyCar, because of its technical rules, has really good cost containment, as does Extreme E. So I think the fiscal responsibility in sport is critically important to ensure it's sustainable and to make the sport fair and give a balanced opportunity to win."
