There has been no reported injuries with Dumervil, who had skipped all of the voluntary workouts this offseason like he's done most years. Dumervil, who is scheduled to make $5 million this season, is signed through the 2017 season. He led the Ravens last season with six sacks, which were his fewest since he missed the entire 2010 season.
Monroe was expected to participate this week after announcing he had been cleared to play. He underwent season-ending shoulder surgery last season.
But Monroe also tweeted Friday that the Ravens were distancing themselves from him and his cause, which could explain his absence from Tuesday's practice. He has been campaigning vigorously for the NFL to take medical marijuana off its banned substances list.
If the Ravens trade or release Monroe, they would create $6.5 million in cap room and take on $2.2 million in dead money in 2016 and $4.4 million next year. Ronnie Stanley, the No. 6 overall pick in this year's draft, is working at Monroe's left tackle spot.
The other players not on the field Tuesday were quarterback Joe Flacco (knee); wide receivers Breshad Perriman (knee), Steve Smith (Achilles) and Michael Campanaro (calf); cornerback Jumal Rolle (Achilles); linebacker Terrell Suggs (Achilles); defensive tackle Michael Pierce (undisclosed) and defensive end Bronson Kaufusi (back).