For 2021, Green revealed his plans for the year in a response to a fan's question on Twitter, who asked him if he had plans to compete in any Xfinity races for RSS as he did in 2020. Green stated that he did not have any races scheduled for the season, and that he would continue as a crew chief with RSS, moving from the Xfinity Series to their part-time ARCA Menards Series car, the No. 28, driven by Ryan's younger brother Kyle Sieg.