But one could argue that it wasn't until Thursday night that the three-time All-Star officially became a Clevelander.
In what has become a new tradition this season, the Cleveland Browns have a celebrity guest smash a guitar decorated in honor of the team's opponent prior to the start of each home game. After future Hall of Fame left tackle Joe Thomas received the honors ahead of Cleveland's home opener against the New York Jets last week, it was Mitchell's turn, with the 26-year-old smashing a Pittsburgh Steelers-themed guitar while wearing a Browns snapback hat and No. 45 jersey ahead of the Thursday Night Football rivalry matchup.
Mitchell's guitar smash proved to be a good omen for the Browns, as Cleveland proceeded to pick up a 29-17 victory over Pittsburgh behind 113 rushing yards and a touchdown from Nick Chubb and 220 passing yards and two touchdowns from quarterback Jacoby Brissett. With the win, the Browns moved to 2-1 on the season, bouncing back from last week's stunning 31-30 loss to the Jets.
As for Mitchell, the Louisville product is preparing to enter his first training camp in Cleveland after spending the first five seasons of his career with the Utah Jazz. But first, he plans on taking in a little bit of his new city.
"I'm going to be able to see a bunch of Browns and Guardians games for sure," Mitchell told reporters at his introductory press conference last week.