With both Lewis Hamilton and George Russell's current deals expiring at Mercedes at the same time as Norris', and with Red Bull's Sergio Perez also out of contract next year, McLaren know that they will have a job on their hands to stop Norris being tempted away.
Despite this, Brown is upbeat regarding the state of McLaren's driver lineup.
“These guys aren’t cheap. We’ve got Lando for another couple [of] years, so we’ve got some time," he told Sky Sports F1. "I like our driver lineup, I love our driver lineup. So, great to get Oscar committed for the foreseeable future and we’ll get to work on Lando, but we’ve got some time."
Piastri growing in confidence
McLaren were quick to act on Piastri, a driver who has impressed in his first season in Formula 1.
His original contract still had another season on it, but Brown has been so sure of what he has seen from him that they wanted to make sure he sticks around for the regulation changes.
“I think there’s a lot more to come, which is the exciting part," Brown continued.
"His maturity I think is what has been most impressive and his technical feedback and understanding. I think no one is surprised at the pace that he has, but he’s so mature, he’s very calm. He takes one session at a time, and come showtime, he’s right there.
"You can see his confidence is growing, because his Fridays now are becoming even more competitive than at the start of the year. Our driver lineup, of all the things we need to be competitive, I’m not worried about a driver lineup."
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