Jenson Button's opportunities to succeed in Formula One are now gone, according to former world champion Nigel Mansell.
"Jenson should have won more races, he has under-performed and that is down to him," Mansell told the BBC.
"He had the opportunity and he didn't take it; there won't be any more," the 1992 world champion added.
Button scored his maiden Grand Prix in last year's Hungarian Grand Prix, after 115 races, but has struggled in this year's championship with an uncompetitive Honda.
This season Button has scored just one point in 11 races and has failed to qualify in the top 16 in the last three Grands Prix.
Mansell believes Button's best days are now behind him.
"Jenson is a great talent," Mansell said. "But he was far better years ago than he is now because he was hungry then. He's got a great reputation for partying and that's taken the edge off it. He's a typical example of too much, too soon.
"He'll have a great lifestyle but he's had his opportunities and it hasn't happened for him."