OWINGS MILLS, Md. -- Pro Bowl cornerback Marlon Humphrey was diagnosed with a season-ending right pectoral muscle tear on Monday, perhaps the biggest loss in a season filled with injuries for the Baltimore Ravens.

Humphrey, 25, became the seventh starter (and third in the secondary) to get sidelined for the season for the Ravens (8-4), who cling to first place in the AFC North by one game. He was injured in Sunday's 20-19 loss in Pittsburgh to the Steelers when he tried to tackle Diontae Johnson before the wide receiver scored the go-ahead touchdown late in the fourth quarter.

Ravens coach John Harbaugh said Humphrey will undergo surgery to repair the torn pectoral muscle.

"We'll go on with the guys we've got," Harbaugh said Monday. "We have really good players who can step in and play and be ready to go."

The loss of Humphrey is not only the latest blow but perhaps also the most devastating one. A two-time Pro Bowl cornerback, Humphrey is the Ravens' most talented defender, who can match up against the opposition's top wide receiver and rip the ball away with his physical play. Since being the No. 16 overall pick in 2017, he is one of two NFL players with at least 50 passes broken up and 10 forced fumbles (safety Logan Ryan is the other).

Injuries have depleted a Baltimore team that has reached the playoffs the past three seasons. After Humphrey is placed on injured reserve, the Ravens will have $44.3 million of their salary cap on IR -- which accounts for 25% of their cap.

Three of Baltimore's players with the five biggest cap hits -- offensive tackle Ronnie Stanley ($10.042 million), cornerback Marcus Peters ($9.968 million) and Humphrey ($8.44 million) -- have suffered season-ending injuries. Overall, the Ravens have lost 11 players who will make more than $800,000 this season.

Baltimore has placed at least one player on injured reserve in four of the past five weeks. The Ravens' total number of players on injured reserve will increase to 17 when Humphrey is added.

"I mean, we've got a lot of injuries, so we've been dealing with stress all season, and we've still been able to overcome it," Ravens nose tackle Brandon Williams said after Sunday's game. "So, that's what we plan on doing. It's a 'next man up' mentality, so the show must go on. We pray that Marlon [Humphrey] makes it back. We pray that everybody who is down right now gets healed up, but we still have games to play. Next week, we have the [Cleveland] Browns, so we have to focus on that."

With Humphrey out, the Ravens are expected to start Chris Westry in his spot, if he's healthy. Harbaugh said he anticipates Westry (thigh) and fellow cornerback Kevon Seymour (reserve/COVID-19 list) to return for Sunday's game at the Cleveland Browns after missing last game. Last week, all five cornerbacks on the 53-man roster missed at least one practice because of an injury or illness.

Through 11 games, the Ravens have lost three starters to season-ending injuries in the secondary: Humphrey, Peters (torn ACL) and safety DeShon Elliott (torn biceps). Strong safety Chuck Clark is the only remaining starter in the secondary from the beginning of the season.

Baltimore is allowing 272.4 yards passing (second-worst in the NFL). The Ravens finish the season against three top-10 rated quarterbacks in Aaron Rodgers, Matthew Stafford and Joe Burrow.

Harbaugh said no one on the team is feeling sorry for themselves after losing so many players to injury.

"These are football problems," Harbaugh said. "There are people out there facing a lot tougher challenges."

During his media session Monday, Harbaugh was asked whether he heard from the officials or the league about the Steelers apparently lining up offside on the Ravens' unsuccessful 2-point conversion.

"I haven't heard anything from the league," Harbaugh said. "You'd like when a guy is lined up that far in the neutral zone, you certainly expect that to be called."

With 12 seconds remaining, Lamar Jackson's pass on the 2-point conversion went off the outstretched hand of tight end Mark Andrews, which led to Baltimore's one-point loss at Heinz Field.

Harbaugh said Sunday that he made the decision to try to win the game with the 2-point conversion attempt because of the team's injuries, particularly Humphrey's.