As a freshman Lewis played in 11 games for the Crimson Tide, making 11 tackles with one sack. He tore a ligament in the first game of his sophomore season against Florida State, causing him to miss the next ten games. He returned for the final game of the regular season against Auburn and played in the postseason, making his first career start in the 2018 College Football Playoff National Championship. He finished the season with 16 total tackles and a sack. Lewis tore his ACL in summer training camp going into his junior season and was forced to use a medical redshirt.