Prior to the beginning of the 2021 season, three more drivers – Norris, Charles Leclerc and Pierre Gasly – and Mercedes team principal Toto Wolff all tested positive for COVID-19 in separate occasions.[39][40][41][42] On the eve of pre-season testing at Bahrain, Alfa Romeo team principal Frédéric Vasseur tested positive for COVID-19, hence unable to accompany the team for testing.[43] Prior to the British Grand Prix, McLaren team principal Zak Brown tested positive.[44]