Rojas will serve as the Twins' opening pitcher for Tuesday's game against the Guardians, Dan Hayes of The Athletic reports.
Rojas most recently worked one inning out of the bullpen Saturday against the Cubs, and he'll most likely be limited to between one and three frames Tuesday before giving way to a bulk reliever. The Twins cleared a spot on the big-league roster after Monday's game by optioning Woo-suk Go to Triple-A St. Paul, meaning the club will likely call up a fresh arm ahead of Tuesday's contest.