According to multiple reports, the 27-year-old will race for the Toro Rosso Formula One team in the United States next weekend with a possibility of racing with the team on a permanent basis in 2018.
Hartley, 27, is a former Red Bull reserve driver who also tested for Toro Rosso in 2009 but has never raced in Formula One and has not been in an F1 vehicle since 2012, before the new generation of turbo hybrid engines.
Gasly was initially handed Daniil Kvyat's F1 auto for two races, Malaysia and Japan, however, Carlos Sainz's early move to Renault means he'll be staying with the team for the remainder of this season. Yes, it's all very complicated.
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The 2017 Le Mans victor has emerged as a front-runner to gain the US Grand Prix audition after years as a reserve driver and time in the junior programme with the Red Bull team.
Sainz is racing for Renault next season and that switch has now been brought forward, with both teams announcing at Suzuka that he would be driving for the French outfit from Austin onwards.
One might wonder why Toro Rosso didn't simply hold on to Sainz for just one more round, which would have allowed Gasly to compete in the Super Formula finale and eliminated the need to find a fourth available driver.
Hartley, the Red Bull official reserve driver in 2009 and 2010, completed one test for the team in 2008 and two for Toro Rosso in 2009 before being dropped from the team's junior programme. Hartley was formerly part of the Red Bull Junior Team and has enough Super License points to compete in Formula One; but he is also now contracted to Porsche in the World Endurance Championship (WEC) and is purportedly in talks with Chip Ganassi for a 2018 IndyCar deal.