ending family ownership of and involvement with the team. Racing Point driver Lance Stroll missed the Eifel Grand Prix after falling ill, which was later diagnosed as COVID-19. He was replaced by Hülkenberg. Lawrence Stroll, owner of the Racing Point team and father of Lance, also tested positive. On 30 November 2020, a day after winning the Bahrain Grand Prix, Drivers' Champion Lewis Hamilton announced that he had tested positive for COVID-19, claiming to have been experiencing "mild symptoms". During the week leading to the race, he underwent three tests, but all returned negative. Mercedes confirmed that Hamilton would miss the Sakhir Grand Prix in Bahrain later that week as a result. He was replaced by George Russell from Williams who was in turn replaced by Jack Aitken. 2021 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. 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. Prior to the British Grand Prix, McLaren team principal Zak Brown tested positive. In January 2021, more changes were made to the 2021 Formula One World Championship, with the 2021 Australian Grand Prix being postponed from 21 March all the way to 21 November. However, the event was eventually cancelled on 6 July 2021 for the second year in a row due to Australia's strict quarantine protocols and travel restrictions to the state of Victoria, where it is held. The race was replaced with the inaugural Qatar Grand Prix. The Chinese Grand Prix was postponed for the second year in a row, and was later eventually cancelled. The event was originally supposed to run on 11 April. In response to this, two GPs would have to fill in the vacancies and F1 chose to run the Emilia Romagna Grand Prix on 18 April and the Portuguese Grand Prix on 2 May. These were announced in January and February 2021 respectively, just before the season started. Further with cancellations, the Canadian Grand Prix was cancelled for the second year running and was replaced by the Turkish Grand Prix. The original date for the GP was 13 June. A month later on 14 May, the Turkish Grand Prix was postponed due to travel restrictions,