“Cory is a beloved member of the GLEE family and we fully support his decision to seek treatment,” GLEE producer 20th Century Fox TV said in a statement.
“Everyone at the show wishes him well and looks forward to his return.”
Finn has helped run the GLEE club this season and recently decided to become a teacher.
This is not Monteith’s first stint in rehab. The actor has been open about his addiction problems in the past and two years ago revealed that he entered rehab when he was 19.