Oscar Piastri has struggled to match his title rival and McLaren team-mate Lando Norris in recent weeks because he was "already at his limit," according to 1997 Formula 1 world champion Jacques Villeneuve.

Piastri appeared to be heading towards a maiden Drivers' Championship when he won the Dutch Grand Prix in late August to score his seventh victory of the opening 15 rounds and move 34 points clear of Norris.

However, the 24-year-old Australian hasn't won in the five races since then, and his failure to even make the podium at the last four allowed Norris to reclaim the championship lead for the first time since April with a dominant win at the Mexico City Grand Prix.

With four rounds remaining, starting with this weekend's Sao Paulo Grand Prix, Villeneuve is unsure whether Piastri wil

See Full Page