UPDATE: According to NASCAR.com, the complete list of participating teams and drivers is as follows:
| No. | Driver(s) | Organization | Car |
| 2 | Austin Cindric | Team Penske | Ford |
| 6 | Brad Keselowski | RFK Racing | Ford |
| 7 | Corey LaJoie | Spire Motorsports | Chevrolet |
| 8 | Tyler Reddick | Richard Childress Racing | Chevrolet |
| 9 | Chase Elliott | Hendrick Motorsports | Chevrolet |
| 10 | Aric Almirola | Stewart-Haas Racing | Ford |
| 12 | Ryan Blaney | Team Penske | Ford |
| 14 | Chase Briscoe | Stewart-Haas Racing | Ford |
| 16 | Justin Haley, Daniel Hemric | Kaulig Racing | Chevrolet |
| 18 | Kyle Busch | Joe Gibbs Racing | Toyota |
| 19 | Martin Truex Jr. | Joe Gibbs Racing | Toyota |
| 21 | Harrison Burton | Wood Brothers Racing | Ford |
| 22 | Joey Logano | Team Penske | Ford |
| 24 | William Byron | Hendrick Motorsports | Chevrolet |
| 38 | Todd Gilliland, Michael McDowell | Front Row Motorsports | Ford |
| 42 | Ty Dillon | GMS Petty Motorsports | Chevrolet |
| 45 | Kurt Busch | 23XI Racing | Toyota |
| 47 | Ricky Stenhouse Jr. | JTG Daugherty Racing | Chevrolet |
| 99 | Ross Chastain, Daniel Suarez | Trackhouse Racing | Chevrolet |
ORIGINAL POST 12-14-2021: NASCAR will hold a two-day Next Gen organizational test this week at Charlotte Motor Speedway on Wednesday and Friday, December 15 & 17.
Testing will not be conducted Thursday so NASCAR can evaluate Wednesday’s results.
Cup test 8a-4p ET Wed & Fri (not testing Thu so can evaluate/set plan for Fri) at Charlotte oval. NASCAR stream on website (holiday light show in grandstands so no fan access). 1-2 car teams get 1 car, 3-4 car teams get 2. Can use multiple drivers. Who is testing for most teams: pic.twitter.com/TY3WmKQFu9
— Bob Pockrass (@bobpockrass) December 13, 2021
Coverage of testing will be shown on NASCAR.com’s YouTube channel.