SANTA CLARA, Calif. (AP) - The San Francisco 49ers placed linebacker Aldon Smith on the reserve non-football injury list Monday as he enters rehab for substance abuse and begins what team CEO Jed York has termed an indefinite absence.
"I am taking a leave of absence to address my health," Smith said through the team. "I am sorry that I have affected my team, my family and the organization. I will do everything in my power to handle this situation the best way possible. I appreciate the support of the 49ers and our fans."
The NFL said there is no minimum number of games Smith must miss on the reserve non-football injury list, and he can return when ready.
On whether he expects Smith to return this season, coach Jim Harbaugh said only, "there's a process, we're going to respect that process."
Smith played Sunday and had five tackles just two days after he was arrested and jailed Friday morning on suspicion of DUI and marijuana possession. Smith apologized after the 27-7 home loss to the Colts, and now his team moves forward without him heading to St. Louis on Thursday.
"We're very supportive of Aldon as we are of all of our players, all of our coaches, our personnel. Always support it in house," Harbaugh said. "We've hashed through it, now we're taking steps and Aldon's taking steps. We support him in that."
San Francisco didn't immediately announce a corresponding roster move.
"We have a pretty good idea what we're going to do and we'll make that announcement," Harbaugh said.
Smith had previously been arrested on suspicion of DUI in January 2012 in Miami shortly after the 49ers lost in the NFC championship game. He is expected to remain in the Bay Area for treatment.
He could face a suspension from the NFL either later this season or next season, and it is likely given he has had more than one infraction. The NFL would let the legal process play itself out first.
Harbaugh said Dan Skuta, Ahmad Brooks and Corey Lemonier will help fill the void left by Smith, who had a franchise-best 191â„2 sacks last season.
"I have confidence in those guys and know they'll do a good job," Harbaugh said. "Go with the guys we've got."
Smith, selected seventh overall in the 2011 draft out of Missouri, turns 24 on Wednesday.
Harbaugh and general manager Trent Baalke ultimately decided to let Smith play before he entered rehab.
"Aldon Smith is taking a leave of absence to address a personal matter," Baalke said in a statement. "The 49ers organization both respects and supports Aldon's decision and commends him for taking responsibility for his actions. The long-term well-being of our players is paramount and we will stand by Aldon as he works toward addressing this issue. Due to the private nature of the matter, we will have no further comment."
His 49ers teammates were trying their best not to let the situation become a distraction. San Francisco (1-2) has a quick turnaround to face division foe St. Louis on the road Thursday night.
"Coach decided to let him play, and he was out there and made some plays," safety Donte Whitner said. "I don't think guys were out there thinking about Aldon being arrested."
Earlier this month, Smith and former teammate Delanie Walker were named in a lawsuit filed in Santa Clara County Superior Court by a Northern California man who said he was shot at a party at Smith's house June 29, 2012.
The players charged a $10 admission and $5 per drink, the lawsuit said. Smith and Walker, the now-Titans tight end were allegedly intoxicated on Smith's balcony when they fired gunshots in the air while trying to end the party, the lawsuit said.
Asked Monday about Smith at Titans headquarters, Walker said he is getting more attention because of his status as one of the best in the NFL at his position.
"I pray for him because he is a good kid," Walker said. "He's just making some bad choices now."