Pitta, the team's second-leading receiver last season, was activated off the injured reserve-designated for return list Saturday. He dislocated his hip on July 27 and practiced for the first time Nov. 20.
With Pitta active, the Ravens scratched Dallas Clark, who is third on the team with 31 catches and three touchdowns.
Dumervil, the Ravens' sacks leader, will not play after not practicing all week with an injured ankle. He was listed as doubtful on Friday's injury report.
This marks the first time he will be sidelined since September 2011. He wasn't expected to play a lot against the run-first Minnesota Vikings.
Here's the complete injury report for the Ravens and Vikings: