After suffering a setback in a pre-game workout prior to the Week 3 loss to Cincinnati, Ravens rookie wide receiver Breshad Perriman has undergone surgery on his injured right knee.Prior to Thursday night’s game in Pittsburgh, head coach John Harbaugh confirmed that Perriman underwent arthroscopic surgery on his posterior cruciate ligament. The 2015 first-round pick is out indefinitely after the arthroscopic procedure was performed by renowned orthopedist Dr. James Andrews.Working out at M&T Bank Stadium with wide receivers coach Bobby Engram on Sunday morning, Perriman pulled up lame and hadn’t participated in light workouts this week after returning to practice on a limited basis on Sept. 24. However, Harbaugh said Tuesday he was unaware of the young wideout suffering any setback when asked by local media who witnessed it Sunday morning.“I have no idea what you’re talking about,” Harbaugh said. “No idea what you’re talking about.”Selected with the 26th overall pick of April’s draft to replace free-agent departure Torrey Smith in the vertical passing game, Perriman injured his right knee on the first day of training camp on July 30. It now remains unclear when or if the 6-foot-2 Central Florida product will play in 2015 as the Ravens continue to lack a deep threat in the passing game.The latest setback is very disappointing for a Ravens team off to its worst start in franchise history. Even if the 2015 season can’t be salvaged, Baltimore would like to see what it has with the first-round pick as the 36-year-old Steve Smith has already announced his intentions to retire at the end of the season.