Ngata returned to practice Friday on a limited basis and appeared to have his normal mobility after being sidelined the previous two days.
"He had little tweaks and strains and things like that, so we gave him a couple days," Harbaugh said. "He looked good, so he's going to play. He should be fine."
Besides Ngata, 10 other Ravens are questionable. That includes Pro Bowl kick returner Jacoby Jones, who was limited all week while still recovering from a sprained right knee that has forced him to miss the past four games.
"He looked good," Harbaugh said of Jones. "So, encouraged."
Wide receiver Marlon Brown (hamstring), cornerback Chykie Brown (hamstring), safety Michael Huff (back), linebacker Albert McClellan (sprained right shoulder), guard Kelechi Osemele (back spasms), running back Bernard Pierce (hamstring), defensive end Marcus Spears (knee), wide receiver Brandon Stokley (groin, hip) and center Ryan Jensen (foot surgery) were all listed as questionable for Sunday's game and limited in practice. Huff was added to the injury report Friday.
Backup nose tackle Terrence Cody (sprained left knee) is doubtful and could just as well be listed as out, because he hasn't practiced or played in a game since getting hurt against the Houston Texans.
Progress for McClain
Harbaugh confirmed Friday that inside linebacker Jameel McClain has been granted medical clearance following a spinal cord contusion he suffered last December against the Washington Redskins.
McClain is eligible to return to practice next week after being placed on the reserve/physically-unable-to-perform list and missing the first six games, but the Ravens haven't determined when he'll start practicing.
"Jameel McClain, it was reported that he was cleared, and there is some truth to that," Harbaugh said. "The back specialists have looked at his most recent MRIs, and it was very favorable. I'm not in a position to say completely 100 percent, I don't know that. There's a process still involved, but it's encouraging to say the least. It's all positive."
Bracing for big front
The Ravens offensive line has an especially weighty task this week: blocking the Packers' hefty defensive line.
"Everybody is over 320 pounds to 330 pounds," Osemele said. "They're big guys, strong, can move a lot. It's going to be a challenge this week. They're a really good defensive line. Raji's a big dude. I'm going to have my hands full this week."
Sense of humor
During a team meeting this week, Harbaugh showed the players an amusing video of himself unsuccessfully attempting to chest-bump strong safety James Ihedigbo following an interception that was later overturned. Rushing to celebrate with his teammates, Ihedigbo never saw Harbaugh leap into the air exuberantly.
"I have a good sense of humor," Harbaugh said. "I was kind of proud of the video. There was some good air between my feet and the ground there, absolutely. I played it off a little bit. I kind of turned and gave a little fist bump, you know."
The episode caused wide receiver Torrey Smith to break into laughter in the locker room earlier this week.
"I think it's one of the funniest things I've seen in my entire life," Smith said. "It was terrible, man. He just looked so unathletic."
Rookie outside linebacker John Simon wasn't fined for his late hit that drew a personal foul against the Dolphins. "It was a dumb play," he said. ... The Packers ruled out cornerback Casey Hayward (hamstring) as well as linebackers Clay Matthews (thumb surgery) and Brad Jones (hamstring), running back James Starks (knee) and center-guard Greg Van Roten (foot). Cornerback Jarrett Bush (hamstring) is questionable.