Stamets was designated for assignment by the Indians on Wednesday, Zack Meisel of The Athletic reports.
This move frees up a roster spot for Thursday's starter, Danny Salazar (shoulder), who was activated from the 60-day IL in a corresponding move. The 27-year-old Stamets has spent most of the season with Triple-A Columbus, slashing just .232/.313/.378 with six homers and 12 steals in 71 games for the Clippers.