Team officials expressed hope that outpatient surgery performed Wednesday will allow Lewis to play perhaps as soon as next week against the Pittsburgh Steelers, but are no longer as optimistic about his prospects for the Atlanta game at M&T Bank Stadium.
"I don't know how much of a difference it will make for this week, but it's my understanding that it will make a huge difference for him and we'll see how he is at the end of the week," said Ravens coach Brian Billick in reference to Lewis' surgery. "He's made real progress, I think."
With Lewis' likely absence from the starting lineup for the second consecutive week, a rare starting opportunity beckons for Johnson. Capable of playing outside linebacker, defensive end and defensive tackle, the 6-foot-3, 270-pounder is preparing to operate next to inside linebacker Bart Scott.
Because of his size, strength and aggressiveness, the Ravens plan to use Johnson primarily on first and second downs while former practice squad member Dennis Haley fills in on obvious passing downs. Scott will move over a few yards to play Lewis' spot with Johnson occupying Scott's normal position.
Drafted in the fourth round out of Alabama in 2003, Johnson is the epitome of a blue-collar worker who thrives on contact.
The Ravens will need that physical presence against the Falcons' top-ranked rushing offense that features shifty halfback Warrick Dunn and ultra-mobile quarterback Michael Vick. "It's cool, it's been different, but it's part of the process," Johnson said. "Outside linebacker was definitely an easier transition than inside, but I'm kind of slowly picking up what we're doing and gradually getting into it at inside linebacker.
"I'm proud that I can know and play more than one position, because it means the coaches believe in you and aren't afraid to give you a chance to show what you can do."
This marks Johnson's second position conversion in as many seasons.
He completed his transition from defensive line to outside linebacker last year when Dan Cody blew out his knee during training camp, and has primarily played standing up ever since. In four seasons, Johnson has started at four different positions.
"He's a very astute and intelligent guy, so he'll have no problem making adjustments," Scott said. "He's shown me that already in practice. With Jarret, you know he'll work hard, bust his butt and take the coaching so he can get it done. "It's nice that he's a big guy, too, because he can go be the fullback for me. I'll scrape and get the running back."
During last week's 27-26 win over the Tennessee Titans, the Ravens threw Haley into the mix out of sheer necessity because Lewis' backup, Mike Smith, partially dislocated his shoulder during the first five plays. He responded with nine tackles and two pass deflections.
With Johnson's reputation for being technically sound and physically tough as Baltimore takes on a rushing attack that averages a league-high 198.9 yards per game and 5.7 yards per carry, the Ravens' major concern is his lack of experience and mobility in pass coverage.
"My teammates are going to help me out and let me know what I'm supposed to be doing," Johnson said. "If I'm not used to doing a certain thing on a play, Bart can just go, ‘You've got this.' He's been the biggest help.