The 19-year-old grandson of team owner Joe Gibbs from Charlotte, North Carolina, will be substituting for Kurt Busch for a third consecutive Cup Series weekend at the Irish Hills.
The two-time Xfinity Series champion from Corning, California, led a race-high 38 of 86 over-scheduled laps before fending off Chastain in overtime to grab his second Cup Series career victory.
The 40-year-old Allmendinger from Los Gatos, California, led all but 20 of 62-scheduled laps en route to his third Xfinity Series victory of 2022 at the Brickyard.
The 2016 Indianapolis 500 champion dominated the second half of the Gallagher Grand Prix to snap a 49-year winless drought and score his eighth IndyCar career victory.
