Ngata has no torn ligaments, according to a source who characterized the injury as roughly the same as the sprained knee that forced him out of the Ravens' Super Bowl XLVII victory over the San Francisco 49ers.
Ngata didn't practice all of last week. He's expected to try to return to practice later this week, per a source.
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Tight end Dennis Pitta returned to practice on a limited basis. He was running routes and catching passes at half-speed and wasn't noticeably favoring his surgically-repaired right hip.
Pitta remains on the injured reserve-designated to return list.
Meanwhile, rookie wide receiver Marlon Brown returned to practice after being out for the Chicago game with a knee injury. He tried to warm up before kickoff, but looked hesitant trying to cut.
"Yeah, I'm feeling good," Brown said. "I bruised it in practice last week. I was being smart not playing last week. I'm fine now."
Brown participated fully as well as wide receiver Brandon Stokley (groin).
Middle linebacker Daryl Smith (hamstring) and cornerback Lardarius Webb (abdominals) were limited.
Ravens general manager Ozzie Newsome was back at his customary spot watching practice in the cold weather after returning to work Monday following a health scare Sunday in Chicago that caused him to be briefly hospitalized for tests.
Newsome said on Monday that he felt fine and that it was unclear what was bothering him.
For the New York Jets, wide receiver Santonio Holmes (foot, hamstring) and linebacker Garrett McIntyre (knee) didn't practice. Wide receiver Jeremy Kerley (elbow) and tight end Kellen Winslow (knee) were limited.
Participating fully for the Jets: offensive lineman Willie Colon (calf), cornerback Antonio Cromartie (hip), defensive lineman Kenrick Ellis (back), quarterback David Garrard (knee) and wide receivers Stephen Hill (knee) and Greg Salas (finger).