Alpine team chief Otmar Szafnauer on Friday accused the team's reserve driver Oscar Piastri of lacking "integrity" as a row over his future continued to dominate paddock gossip at the Belgian Grand Prix. Piastri, a 21-year-old Australian who has won the Formula Three and Two titles in successive seasons en route to a F1 career, is at the centre of a contract dispute involving Alpine as he seeks to break free. Alpine claim that Piastri, managed by compatriot and former F1 driver Mark Webber, signed a contract with them for 2023, which he has rejected as he bids to move elsewhere.