Vrabel hired McMillan in 2021 as a defensive assistant where he primarily worked with Titans outside linebackers. In 2022, he worked as a defensive line assistant coach alongside Williams, who was named the Patriots defensive coordinator. McMillan continued to work with Titans defensive lineman in 2023.

Former Tennessee Titans coach Mike Vrabel is heading back to New England to be the next coach of the Patriots, where he'll play vs the Titans in 2025.

With Mike Vrabel having spent a season with the Cleveland Browns, there was always going to be a risk he would poach an assistant or two at his next head coaching job.