Ravens rookie wide receiver Breshad Perriman will be sidelined indefinitely after he had arthroscopic surgery this week to repair a torn posterior cruciate ligament in his right knee.
It's now unclear when -- or even if -- Perriman will play this season.
Coach John Harbaugh, on the WBAL radio pregame show, said Perriman met with Dr. James Andrews Wednesday, and had a scope on Thursday.
"He didn't see anything new," Harbaugh said. "There's no injury of any kind, it's just a slow-healing ligament, for whatever reason. Very slow. We're a little surprised to say the least, that it's healing this slowly, but that's what it's doing. So its just going to be a matter of time."
Harbaugh indicated Perriman had a stem cell injection to speed up the healing process, as well.
"That should help a little bit too, but it's going to be a little bit of time," Harbaugh said. "Hopefully shorter rather than longer, and we'll keep working hard to try to get him back."
Harbaugh said he met with general manager/executive vice president Ozzie Newsome and team president Dick Cass, along with team doctors Andrew Tucker and Leigh Ann Curl, to get an update when they arrived at the stadium Thursday.
On Tuesday, Harbaugh was asked about Perriman and whether he had a setback during pregame warmups against the Cincinnati Bengals on Sunday, and he said, "I have no idea what you're talking about."
He repeated the same quote two other times.
Baltimore Ravens Insider
Perriman hasn't played this season after hurting his knee on July 30, the Ravens' first full-team training camp practice. He returned to practice late last week and appeared to be nearing a return. However, he suffered a setback while going through an on-field workout before last Sunday's game against the Cincinnati Bengals.
Running a post route, Perriman pulled up lame in the end zone while trying to catch a pass thrown by wide receivers coach Bobby Engram. He limped toward the back of the end zone and spent a significant amount of time leaning against the stadium wall and flexing his knee. Aside from catching some footballs while standing in place, Perriman's workout was over.
He did not practice early this week and was declared out for tonight's game against the Pittsburgh Steelers.
The 26th overall selection in the 2015 draft, Perriman's absence has left the Ravens without a bona fide deep threat, and one of the playmakers that they were counting on for the 2015 season.
NFL Network first reported Perriman's surgery.