OWINGS MILLS - Ravens middle linebacker Ray Lewis has been placed on the NFL's new injured reserve/designated for return list, leaving open the possibility he could return at some point later in the season.
Lewis is eligible to return to practice in six weeks and could play after eight.
However, a return seems unlikely.
The 37-year-old Lewis underwent surgery on his torn right triceps Wednesday, a procedure that typically involves a six month recovery.
"Obviously, it's a very serious injury," Baltimore coach John Harbaugh said, "but there's an opportunity and we're going to keep the door open, and we'll just see where that goes going forward."
Lewis had a team-high 57 tackles through the Ravens' first six games.
SUGGS RETURNS: Outside linebacker Terrell Suggs practiced Wednesday after being activated from the physically unable to perform (PUP) list.
Suggs had surgery in May to repair a partial tear of his right Achilles tendon.
Harbaugh emphasized the team will take a cautious approach with Suggs.
"To what extent, to what he is able to do, we should just temper our expectations a little bit," Harbaugh said. "He's coming off a very serious injury, an Achilles tear. We'll just see how he does."
Harbaugh reiterated there is still no timetable for when Suggs will be ready to play.
"I don't have a timetable on that," Harbaugh said. "It's going to be day-by-day, it really is."
ROSTER MOVES: The Ravens promoted running back Bobby Rainey and middle linebacker Josh Bynes from the practice squad to the active roster and signed linebacker Nigel Carr and cornerback Jordan Mabin to the practice squad.
The 5-foot-8, 212-pound Rainey was one of the pleasant surprises of training camp and the preseason, referred to by fullback Vonta Leach as "a clone to Ray Rice." He finished the preseason with 23 carries for 55 yards and a team-high 14 catches for 163 yards and two touchdowns. He made Baltimore's original 53-man roster before being cut prior to the Ravens' season-opening win against the Cincinnati Bengals in favor of fellow running back Anthony Allen, a move Harbaugh attributed to Allen's value on special teams.
"Bobby's a guy we wanted on the 53-man roster," Harbaugh said. "We're fortunate that he was still with us on the practice squad this late in the season. He's a guy we were kind of itching to get up anyway."
Bynes missed the preseason with a back injury, but had 12 tackles and two sacks as a rookie during last year's preseason.
Carr and Mabin both spent training camp and the preseason with Baltimore.
Carr had a team-high 17 tackles during the preseason.