McLaren team principal Andrea Stella has welcomed tweaks to Formula 1's new technical regulations ahead of the Miami Grand Prix, but has called for a more comprehensive rethink of the sport's controversial power units in future seasons. The sport introduced hybrid engines with a near 50/50 split between electric power and combustion power earlier this year and agreed to make relatively small changes to the regulations to limit unusual driving practices in qualifying and reduce the risk of dangerously high closing speeds between cars in races. Stella also suggested physical changes to hardware of the power units for future seasons, suggesting that larger batteries or more fuel could be considered.