"Arthur had a sports hernia surgery right after the rookie minicamp," said coach John Harbaugh. "So, he's recovering from that. He should be fine soon enough."
The recovery time is normally four-to-six weeks. The Ravens' final organized work ends with the June 11-13 minicamp, but rookies can be kept around longer.
Brown is a candidate to replace Ray Lewis at one of the inside linebacker positions in Baltimore's 3-4 defense. In addition to Lewis' retirement, the Ravens lost Dannell Ellerbe, who started seven games at the other starting inside linebacker position last season, when he signed a blockbuster deal with the Miami Dolphins in free agency.
Former Oakland Raiders first-round pick Rolando McClain signed with the Ravens as a potential replacement, but he abruptly retired last week without ever suiting up for the Ravens.
The Ravens drafted the All-American from Kansas State in the second round of the 2013 draft in April.
Brown, 6-0, 242, said after rookie minicamp that he had a considerable amount of homework to do before he felt comfortable assimilating to a 3-4 defense. Kansas State played a traditional 4-3 defense with Brown at middle linebacker.
"It's a transition in many ways - that in particular," Brown said after his first practice. "I am up to doing whatever I can to learn from the guys that are here and be a role player."
The Ravens are encouraged by how cornerback Lardarius Webb and inside linebacker Jameel McClain are doing after finishing last season on injured reserve.
Both players participated in individual drills Wednesday.
Webb tore his anterior cruciate ligament October against the Dallas Cowboys. McClain is recovering from a spinal cord contusion sustained last December against the Washington Redskins.
"Yes, very encouraged with Lardarius and Jameel really throughout," Ravens coach John Harbaugh said. "They have both done a great job with their rehab. They have had no setbacks, so they are on schedule."
The Ravens had high attendance at the voluntary workout, but a handful of veteran players were absent.
That included outside linebacker Terrell Suggs and defensive tackle Haloti Ngata, fullback Vonta Leach, defensive tackle Chris Canty and offensive guard Marshal Yanda.
"Every guy that comes or isn't here has their reason, and they are in communication with us," Ravens coach John Harbaugh said. "It's a voluntary workout. We coach the guys who are here, though.
"I like the fact that we have a number of guys here. Practices have been very, very fast and very efficient. The first couple of days, we didn't make a lot of mistakes. Guys seem to know what they are doing."
Dancing With the Stars is over, so Pro Bowl kick returner Jacoby Jones is set to rejoin his teammates.
Jones finished third in the dancing competition.
"I thought he did great, I was proud of Jacoby through the whole thing," Ravens coach John Harbaugh said. "I'm looking for him to on the next flight back here to Baltimore, Jacoby. So, he should be getting off the plane any second here at BWI. He should be in great shape. I thought he did great. I was proud of him. He represented all of us very well."
"It'll be fun. It was kind of cool to watch him throughout the whole thing, and it'll definitely be exciting to come out here and see what kind of person he is these days."—Ravens quarterback Joe Flacco on wide receiver and Dancing With the Stars contestant Jacoby Jones.
Tight end Dennis Pitta signed his $2.023 million second-round restricted free-agent tender with the Ravens Monday. Pitta had interest from the Miami Dolphins and San Francisco 49ers, according to the Baltimore Sun, but neither team presented Pitta with an offer sheet.
The Ravens would still like to sign Pitta to a long-term deal because he would become an unrestricted free agent in 2014.
Last season, Pitta had a career-high 61 receptions for 699 yards and seven touchdowns. He added 14 catches for 163 yards and three scores in the Ravens four playoff victories.
A closer look at the Ravens' picks:
Round 1/32 - Matt Elam, S, 5-10, 210, Florida
The All-American defensive back and younger brother of NFL safety Abram Elam should provide toughness and range to a secondary that lost Ed Reed to the Houston Texans and cut Bernard Pollard. He's expected to immediately compete for a starting job at strong safety, but will also cross-train at free safety.
Round 2/56 - Arthur Brown, LB, 6-0, 241, Kansas State
Brown has drawn comparisons to a young Ray Lewis because of his lack of ideal size, speed and emotional, relentless style of play. The Big 12 Defensive Player of the Year figures to immediately start at one of the inside linebacker spots in the Ravens' 3-4 scheme.
Round 3/94 - Brandon Williams, DT, 6-1, 335, Missouri Southern
Anchor style nose tackle and Division II All-American who bench-pressed 225 pounds 38 times at the NFL scouting combine. Athletic for his size and can do a handstand and walk, performed well at Senior Bowl and will challenge Terrence Cody for playing time.
Round 4/129 - John Simon, OLB, 6-1, 257, Ohio State
Gritty, hard-nosed Big Ten Defensive Player of the Year had career-high nine sacks last season. Should compete for a situational pass rusher role at rush linebacker behind former Pro Bowl outside linebacker Terrell Suggs.
Round 4/130 - Kyle Juszczyk, FB, 6-1, 248, Harvard
Excelled at Senior Bowl and took a dozen visits after starring in Ivy League as pass-catching fullback. Ravens figure to utilize him at fullback, tight end and H-back and expected to eventually replace Pro Bowl fullback Vonta Leach.
Round 5/168 - Ricky Wagner, T, 6-6, 308, Wisconsin
All-Big Ten Conference tackle has played left tackle for past two seasons after playing right tackle. Former prep basketball player isn't an elite athlete, but could also get a look at guard.
Round 6/200 - Kapron Lewis-Moore, DE, 6-4, 298, Notre Dame
Accomplished player tore his right ACL in national championship game loss to Alabama. Figures to be a medical redshirt as a rookie, essentially, since he just had surgery three months ago.
Round 6/203 - Ryan Jensen, C, 6-3, 317, Colorado State-Pueblo
Plays with a nasty streak and is quick (5.28 40-yard dash) and strong (bench-pressed 225 pounds 30 times). Drew interest from multiple NFL teams, including the Patriots, and is slated to back up Gino Gradkowski at center after primarily playing tackle in college.
Round 7/238 - Aaron Mellette, WR, 6-2, 217, Elon
Imposing small-school standout could provide red-zone threat immediately. Mellette caught 11 passes with one touchdown against Vanderbilt and played in the Senior Bowl.
Round 7/247 - Marc Anthony, CB, 5-11, 196, California
Productive and tough, but faces uphill climb to make the 53-man roster and will need to beat out Asa Jackson and Chris Johnson to do so. Could be a quick special-teams contributor if he makes the cut.
TE Billy Bajema is a blocking tight end who could return potentially for the veteran minimum.
LB Ricky Brown spent the season on injured reserve with a concussion and isn't expected to play football anymore.
S Sean Considine is a valuable special-teams player who could be in the plans at some point if he's willing to play for a minimum salary.
NT Ma'ake Keomeatu, 34, would like to continue playing for a few more seasons after revitalizing his career last season after being out of football the previous year due to weight and injury issues. Kemoeatu is regarded as unlikely to return.
DE Ryan McBean spent the season on injured reserve with a broken ankle. He has said he would like to return, but it's unclear if the team wants him back.
TE Ed Dickson (tendered at 1.323M with third-round pick as compensation) is one of the best blockers on the team.
LB Arthur Brown (2/56): 4 yrs, terms unknown.
LB John Simon (4/129): 4 yrs, terms unknown.
FB Kyle Juszczyk (4/130): 4 yrs, terms unknown.
T/G Ricky Wagner (5/168): 4 yrs, terms unknown.
DE Kapron Lewis-Moore (6/200): 4 yrs, terms unknown.
C Ryan Jensen (6/203): 4 yrs, terms unknown.
WR Aaron Mellette (7/238): 4 yrs, terms unknown.
CB Marc Anthony (7/247): 4 yrs, terms unknown.
RB Anthony Allen: ERFA; 1 yr, terms unknown.
RB Damien Berry: Not tendered as ERFA; terms unknown.
S Omar Brown: ERFA; terms unknown.
LB Josh Bynes: ERFA; terms unknown.
LS Morgan Cox: Potential RFA; $2.5M/2 yrs, $500,000 SB.
QB Joe Flacco: Potential UFA; $120.6M/6 yrs, $29M SB.
DT Bryan Hall: ERFA; terms unknown.
LB Adrian Hamilton: ERFA; terms unknown.
T Ramon Harewood: Not tendered as RFA; terms unknown.
S James Ihedigbo: Potential UFA; 1 yr, terms unknown.
CB Chris Johnson: UFA; 1 yr, terms unknown.
DE Arthur Jones: RFA tendered at $2.023M with second-round pick as compensation; $2.023M/1 yr.
S Anthony Levine: ERFA; terms unknown.
DE Albert McClellan: ERFA; $555,000/1 yr.
T Bryant McKinnie: UFA; $7M/2 yrs.
TE Dennis Pitta: RFA tendered at $1.323M with second-round pick as compensation; $1.323M/1 yr.
RB Bobby Rainey: ERFA; terms unknown.
WR/KR David Reed: Potential RFA; 2 yrs, terms unknown.
DL Chris Canty: FA Giants; $8M/3 yrs, $2.8M guaranteed.
LB Elvis Dumervil: FA Broncos; $26M/5 yrs, $7.5M SB/$11M guaranteed.
QB Caleb Hanie: FA Broncos; $715,000/1 yr.
S Michael Huff: FA Raiders; $6M/3 yrs, $1.5M SB.
DE Marcus Spears: FA Cowboys; $2.75M/2 yr, $600,000 SB.
C A.Q. Shipley (trade Colts).
LB Brendon Ayanbadejo (released).
C Matt Birk (retired).
WR Anquan Boldin (traded to San Francisco 49ers).
S Emmanuel Cook: Rights terminated as ERFA.
LB Dannell Ellerbe: UFA Dolphins; $35M/5 yrs, $7M SB/$17M guaranteed.
LB Paul Kruger: UFA Browns; $40.5M/5 yrs, $6M SB/$20M guaranteed.
LB Ray Lewis (retired).
S Bernard Pollard (released).
S Ed Reed: UFA Texans; $15M/3 yrs, $5M guaranteed.
G Bobbie Williams (released).
CB Cary Williams: UFA Eagles; $17M/3 yrs, $10.5M guaranteed.
S Tom Zbikowski (released).