The news comes after he was arrested last week for allegedly driving under the influence of drugs and/or alcohol. The athlete's substance abuse also reportedly has caused tremendous tension in his marriage to reality TV personality Khloe Kardashian.
"He realized he needs help," an insider told People.com about his decision to undergo treatment.
No details on where he is staying or how long he expects to be there were immediately reported.
Notable deaths of 2014 [PHOTOS]