But it wasn't clear whether Gasly would be able to race at the upcoming United States Grand Prix, as before replacing Kvyat he had been competing in the Super Formula championship, the final round of which will take place in Suzuka, Japan, at the same time as the US GP, preventing him from attending both.
Speaking to ESPN during winter testing this season, Ricciardo said he rated Hartley as one of his toughest opponents in the early days of his Red Bull career and even credits the Kiwi as one of the reasons he was able to overcome homesickness after his initial move to Europe from Australia.
"What an awesome feeling!" said Hartley, who won the Le Mans 24 Hours this season and was world sportscar champion in 2015.
He tested for the Red Bull team back in 2009 and was a junior driver but it appeared his chances of competing in Formula 1 dried up.
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Coming off a win last weekend at IMSA's Petit Le Mans season finale in a Tequila Patron ESM Nissan DPi, Hartley has become an incredibly popular solution as a stand-in solution between FIA WEC obligations with Porsche.
Mike Thackwell was the last driver from New Zealand to start an F1 race at the 1984 Canadian Grand Prix. 'This opportunity came as somewhat of a surprise, but I never did give up on my ambition and childhood dream to reach F1.
Hartley will partner Kvyat in the United States of America, with the latter having regained a Toro Rosso seat due to Carlos Sainz's move to Renault being brought forward.
"COTA is a track I really enjoy and one I have raced at recently".
"I'm convinced he'll do a fantastic job for us".
"I've got a lot to learn in one week but I feel ready for it, honestly".
And while it might seem likely that Kvyat will stay on, he has now been demoted twice by Red Bull - once from the senior team back to Toro Rosso in May 2016 and then dropped altogether after this year's Singapore event.