The Baltimore Ravens declared offensive tackle Eugene Monroe out for Thursday's night game in Pittsburgh after he was limited in two practices this week.

This will mark the ninth time (including the playoffs) that Monroe has missed a game since signing his five-year, $37.5 million deal before the 2014 season. In fact, since receiving his $11 million signing bonus, he's only played in 13 of 22 games (59 percent).

Monroe has been sidelined for all but one series this season after suffering a concussion on the first drive of the opener. Knee and ankle injuries limited him last season.

Durability hadn't been a concern with Monroe before he was traded from Jacksonville to Baltimore. During Monroe's first five seasons, he was on the field for 4,638 snaps and only seven left tackles played more: D'Brickashaw Ferguson (5,188), Jermon Bushrod (5,115), Joe Thomas (4,991), Andrew Whitworth (4,889), Donald Penn (4,842), Duane Brown (4,830) and Michael Roos (4,808).

The Ravens again must turn to James Hurst, an undrafted second-year player, to protect the blind side of franchise quarterback Joe Flacco. Hurst has graded out as the worst offensive tackle in the NFL through three games, according to Pro Football Focus. He's the 10th-worst run-blocker and he's allowed an NFL-worst 17 quarterback hurries.

Two other backups will start for the Ravens against the Steelers: defensive end Lawrence Guy will replace Chris Canty for the second straight game and rookie Maxx Williams will fill in for tight end Crockett Gillmore.

Ravens injury report

Out: DE Chris Canty (calf), TE Crockett Gillmore (calf), OT Eugene Monroe (concussion) and WR Breshad Perriman (knee).