[6] On September 1, 2018, Brunskill was waived by the Falcons and was signed to the practice squad the next day.

[7][8] In January 2019, Brunskill joined the San Diego Fleet of the newly formed Alliance of American Football (AAF).

Brunskill reached Super Bowl LIV with the 49ers, but they lost 31–20 to the Kansas City Chiefs.

[13] During the 2020 season, he started all 16 games, playing a mix of positions on the offensive line.

After Week 8, Brunskill became the Titans' primary center after recently signed Lloyd Cushenberry suffered a season-ending injury.