According to Motorsport, an announcement could come as soon as today, Sept. 21.
Chastain was originally slated to run for CGR in the Xfinity Series in 2019, but when sponsor DC Solar was forced to pull out, Chastain lost the opportunity and ultimately ran a full season for Niece Motorsports in the Gander RV & Outdoors Truck Series. He finished the season second in Truck points standings.
In 2020, Chastain joined Kaulig Racing full time in Xfinity and is currently competing in the playoffs. In 26 races this season, he’s earned 13 top-five and 23 top-10 finishes. with a best finish of second five times, including last weekend at Bristol Motor Speedway. He’s currently eighth on the Xfinity playoff grid.
UPDATE: CGR confirms Chastain will compete for the team.
Fans, you've been waiting… It's time to 𝙧𝙚𝙫𝙚𝙖𝙡 who will pilot the No. 42 car in 2021 👇🏼
— Chip Ganassi Racing (@CGRTeams) September 21, 2020