SYDNEY, Dec 12 : McLaren Formula One chief executive Zak Brown announced on Friday that his United Autosports outfit will not be involved in Australia's Supercars Championship touring car series from next season.

United Autosports and Andretti Autosport bought into the series in 2017 to form the Walkinshaw Andretti United, which won this year's drivers' championship through Chaz Mostert two weeks ago and the prestigious Bathurst 1000 race in 2021.

Brown said the decision had not been taken lightly and reflected United Autosports' growing commitments in the World Endurance Championship and other series.

"It was an incredibly difficult decision to step away ... but with our WEC program and other racing commitments growing rapidly, the time was right to put our complete focus and energy in

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