Ravens left tackle Eugene Monroe hasn't been cleared to practice all week because of a "pretty serious bruise" on his right forearm, coach John Harbaugh said, an injury suffered Saturday when the Ravens lost three tackles to injury in a 40-17 loss to the Philadelphia Eagles.
Monroe played the first three series of that game -- the same as other starters -- but had ice on his arm later in the game.
Harbaugh said "there's not a fracture or anything like that," and that the issue "should be no problem for the regular season."
But given his lack of practice time this week, Saturday's game is in doubt for Monroe.
Elsewhere on the offensive line, the return of a pair of top offensive line reserves strengthened a unit that has been missing six players all week.
Monroe's top backup, James Hurst, returned to practice Thursday after leaving Saturday's game and missing three practices with a concussion.
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Ryan Jensen, who played tackle for the final three quarters Saturday but missed Wednesday's practice, also returned.
Starting right tackle Rick Wagner is back this week after a leg issue kept him out against Philadelphia, while reserve tackle Jah Reid (back) and guard John Urschel (concussion) are both ready to return to game action, as well.
Urschel could start at left guard for Kelechi Osemele. Osemele has been limited by an Achilles injury all camp, hasn't practiced since last Thursday, and didn't play against the Eagles.
If Hurst is cleared to play, the Ravens could reprise the offensive line from Weeks 5 and 6 of 2014, when Hurst and Urschel started on the left side alongside center Jeremy Zuttah, guard Marshal Yanda, and right tackle Rick Wagner.
Monroe missed four weeks early last season after a minor knee surgery, then missed three games, including the two playoff games, with an ankle injury.