"If you're going to beat Sebastian Vettel in that Red Bull, you'd better be getting up very early in the morning, and thinking about it all day every day," Brundle told Daily Mail.
"And I don't think he has been. Lewis has raw speed and determination, but I think he's going through a difficult time. He said, 'If I only win one Championship it would suck' and he's right.
"He needs to steady everything around him. Vettel is totally focused and has such a simple lifestyle and Lewis hasn't. I suspect the only person who can properly fix things is Lewis. And he isn't going to walk away from the rappers, the celebrity girlfriend and the Hollywood lifestyle."
Martin Brundle talk about a wide-range of topics in the interview with the paper, also revealed that he didn't speak to former team-mate Michael Schumacher for five years.
"We were good mates after I left Benetton," he said. "Then a few years later he read a transcript of something I'd said as a commentator, and he took exception to it. I never found out what it was. Michael is very sensitive, he doesn't like you saying anything negative. When we finally spoke he couldn't recall what it was that had annoyed him."
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