The future of a handful of drivers on the current Formula 1 grid could be up in the air over the next few months as decisions are taken on their futures. It is expected that American driver Logan Sargeant will be replaced at Williams after underperforming in the first half of this season, while Kevin Magnussen’s future at Haas is also up in the air after Oliver Bearman was announced and Esteban Ocon has been linked to the team. Valtteri Bottas is another free agent who could make a switch to another team, provided Sauber chose not to keep him beyond this season. With only one seat available at…