"I'm happy to have the procedure behind me," said Baker in a statement released by the team. "I look forward to getting back on the field with my teammates as soon as possible."
Baker underwent a discectomy, which is the surgical removal of herniated disc material that presses on a nerve root or the spinal cord, according to WebMD.com. Falcons coach Mike Smith said Baker was to have the procedure in California, where he was examined by specialists on Wednesday.
Former Falcons running back Warrick Dunn had surgery to repair a herniated disc five days before training camp began in 2007, and he was ready for the start of the season.
"We really don't want to put a timeframe in terms of how long before he returns," Smith said when he announced plans for the procedure after Wednesday's practice.
Smith said more will be known about Baker's projected recovery period following the surgery, which Smith called "minor."
"After the procedure, I think we'll have a better idea then," Smith said.
Baker missed last week's game at Philadelphia with what was called a hip injury. When Baker did not respond to treatment, he was scheduled for appointments with two specialists.
Baker has started five games at left tackle. He missed the Sept. 28 game at Carolina with a concussion after leaving two games earlier in the month with head injuries.
Todd Weiner, who started for Baker at Philadelphia last week, was limited in practice on Thursday after he was held out of Wednesday's practice with a sore knee.
Smith said Weiner would start at left tackle in Sunday's game at Oakland.
Weiner seemed less confident.
"I think right now it's day to day," Weiner said. "I'll see if I can get a little better each day and get myself ready for Sunday."
Quinn Ojinnaka, who has played in only two games this season, and Gandy split snaps at the position on Wednesday.
"If I can get through a couple of practices and get my wind back, hopefully I can help coach out with whatever he wants," Gandy said.
"Wayne has some familiarity with our verbiage and scheme, having a background in Pittsburgh with Mike," Smith said.
"We'll try to get him up to speed as quickly as we can."
Mularkey was the Steelers' offensive coordinator for Gandy's last two seasons with the team, 2001 and 2002.
"I know about a third of what they are talking about," said Gandy of Mularkey's terminology.
"Football is football. I can catch on in about a week."
The Associated Press contributed to this report