Rortvedt was optioned to Triple-A St. Paul on Tuesday, Brandon Warne of Access Twins reports.
Rortvedt had served as extra catching depth since late August while Mitch Garver was out with a back injury. He went 6-for-19 with a homer in his latest stint with the team. With Garver now healthy, he's no longer needed, so he'll head back to the minors.