Reed is listed with a torn labrum in his shoulder as well as a knee injury.
Yanda has a minor right knee injury.
Ngata has a right shoulder injury and a sprained right medial collateral ligament.
Williams has a sprained left ankle.
And McPhee was out for the Ravens' 25-15 win over the Cleveland Browns with right thigh and knee injuries. He underwent arthroscopic surgery on his right knee twice before training camp.
Williams is limping noticeably after spraining his left ankle against the Cleveland Browns, casting doubt on his availability for Sunday.
"It's minor, that's exactly what it is," Williams said. "I'm treating it, getting it right. It will be good."
Williams is relieved that he didn't aggravate his surgically-repaired right ankle, which he broke last December.
"It's a good thing," he said.
If Williams is unable to go, the Ravens could plug in Jah Reid or former starter Ramon Harewood.
Harewood said he's ready to step in, if needed, adding that he's over his bout with migraine headaches
"They've subsided a little bit," Harewood said. "I've had the migraines since I was young."
Meanwhile, Yanda wasn't concerned about his right knee even prior to having a magnetic resonance imaging exam Monday that confirmed no structural damage.
"Yep, it's fine," said Yanda, who was replaced by Reid for five plays in Cleveland when his knee was examined and re-taped in the locker room. "I'll be good to go. I just got rolled up a little bit. It was just the knee."
The following players were limited: linebacker Josh Bynes (thigh), wide receiver Jacoby Jones (toe), offensive tackle Michael Oher (ankle), wide receiver David Reed (left knee) and cornerback Jimmy Smith (groin).
Participating fully: safety Sean Considine (chest), long snapper Morgan Cox (shoulder), inside linebacker Dannell Ellerbe (thumbs), nose guard Ma'ake Kemoeatu (sprained right knee), safety Bernard Pollard (ribs) and outside linebacker Terrell Suggs (Achilles tendon).
Participating fully: offensive tackle Willie Smith (knee), fullback Marcel Reece (hamstring), linebacker Miles Burris (elbow), linebacker Keenan Clayton (shoulder), defensive tackle Desmond Bryant (cardiac), defensive end Matt Schaughnessy (shoulder), defensive end David Tollefson (shoulder), cornerback Coye Francies (thumb) and safety Mike Mitchell (finger).