Aldon Smith will be placed on the San Francisco 49ers' non-football injury list as he voluntarily enters a treatment facility.

"He will take an indefinite leave of absence," owner Jed York told reporters Sunday.

Smith played in Sunday's loss by the 49ers to the Colts despite being arrested on Friday morning under suspicion of driving under the influence.

"First off, I wanted to apologize to the team, to the organization, my family everybody I let down," Smith said. "I also wanted to let it be known that this is a problem, and this is something I will get fixed and do everything in my power to never let this happen again. I also wanted to let everybody know once again that I am sorry, and like I said, this won't happen again."