Liam Lawson will remain in Formula One, until Daniel Ricciardo returns to full fitness, starting with next weekend's Italian Grand Prix.
Lawson, 21, made his F1 debut at last weekend's Dutch Grand Prix at Zandvoort, coming into the AlphaTauri car, after a crash left Australian Ricciardo with a broken hand.
In his first taste at that level, Lawson impressed with a 13th-place finish in an otherwise chaotic race, after qualifying in 20th.
Ricciardo, 33, has undergone surgery on his hand and will be unable to drive for the foreseeable future. He suffered a metacarpal fracture, which has a standard recovery time of 6-8 weeks.
As AlphaTauri's reserve driver, Lawson will remain with the team for this weekend's Italian Grand Prix at the very least.
Should Ricciardo remain unavailable for the full eight-week recovery time, Lawson would in theory be available for AlphaTauri for the Singapore Grand Prix on September 18, Japanese Grand Prix on September 25 and Qatar Grand Prix on October 9.
Away from Formula One, Lawson is currently racing in Japan's Super Formula Championship this season and sits eight points off the lead, with two races remaining.
Those final two races take place over one weekend at Suzuka on the weekend of October 27-29, which could see the Kiwi return to Super Formula, after the Japanese Grand Prix at the same venue.