Flacco, who practiced on a limited basis all week while wearing a brace on his left knee, was listed as questionable on the injury report but on Sunday is expected to make his 108th consecutive start.
"He looked good," Ravens head coach John Harbaugh said. "I don't know if it was a progression. He looked pretty much the same all week and got through all the practices and took his reps and did well."
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Flacco was hurt on Monday in the Ravens' 18-16 victory over the Detroit Lions, in which he was hit in the knee by Lions' linebacker DeAndre Levy. Flacco admitted that the hit was a "little scary," but he and the team were relieved when a magnetic resonance imaging taken this week revealed only a low-grade sprain to the medial collateral ligament.
Running back Ray Rice, who missed practice Wednesday because of a thigh injury, was also listed as questionable but he's expected to play.
Strong-side linebacker Elvis Dumervil, who leads the team with 91/2 sacks, was added to the injury report after he was a limited participant in Friday's practice and is questionable to face the Patriots. Dumervil sat out the Minnesota Vikings game on Dec. 8 because of an ankle injury, but he returned to play against the Lions.
Reserve linebacker and key special teams player Albert McClellan, who didn't practice all week because of a neck injury, is questionable while cornerback Asa Jackson (hamstring) is doubtful and not expected to play. Tight end Dallas Clark (illness) and rookie safety Brynden Trawick (ankle) are probable.
The Ravens practiced outside Friday for the first time all week as one of their three outside fields was plowed to accommodate the workout. While it doesn't look like they'll have to deal with the snow and cold on Sunday, they may get reacquainted with rain and thunderstorms.
Forecasts for Sunday call for unseasonable temperatures in the low 70s, but what drew Harbaugh's attention was the part of the forecast about possible thunderstorms.
"Does that mean lightning? So, that could be a delay, right?," Harbaugh jokingly asked. "I wouldn't be surprised if that happens."
His comment was a reference to the two weather delays the Ravens have already had this year. Lightning delayed the start of the season opener vs. the Denver Broncos on Sept. 5 and the Ravens' game vs. the Chicago Bears on Nov. 17 was delayed by severe weather.
Their Dec. 8 game against the Minnesota Vikings at M&T Bank Stadium was also played in a snowstorm.
Asked about Rice's comments to Patriots reporters this week that he'd consider retiring when he turns 30 years old — he's now 26 — Harbaugh said: "That's a long time from now. He won't be 30 before Sunday, will he?" … Justin Tucker's 61-yard field goal to beat the Lions was voted the GMC Never Say Never Moment of Week 15. … Patriots safety Devin McCourty provided the closest thing to bulletin board material Thursday when he told CSN New England "There would be no better feeling than us beating them Sunday and … we eliminate their season right there." The Ravens will undoubtedly be made aware of McCourty's comments by game time Sunday, if they haven't been already. … According to ESPN Boston, Belichick took his team to the movies on Friday as part of a revised Friday schedule. ... For the Patriots, wide receiver Josh Boyce (ankle) was declared out. Wide receivers Aaron Dobson (foot) and Kenbrell Thompkins (hip), offensive tackle Nate Solder (concussion), linebackers Dane Fletcher (groin) and Brandon Spikes (knee) and defensive backs Kyle Arrington (groin) and Alfonzo Dennard (knee, shoulder) are all questionable.
Baltimore Sun reporter Aaron Wilson contributed to this article