FLORHAM PARK, N.J. -- It's starting to sound like the Jets might be without Darrelle Revis on Sunday in Pittsburgh.

The star cornerback, who suffered a concussion in Sunday's win over the Bills, still hadn't been cleared for live contact as of midday Thursday, meaning he won't practice for the second consecutive day. On Wednesday, Revis was approved for physical activity, but all that amounts to is lifting weights, running and riding an exercise bike.

Rex Ryan, commenting on Revis' chances of facing the Steelers, sounded less optimistic than previously.

"If he's not 100 percent, Darrelle won't play, it's as simple as that," Ryan said.

The coach said he expects to make a decision before the team leaves on Saturday. They don't want to put a concussed player on an airplane.

"By Saturday, we'd better know something, whether he's going or not," Ryan said. "This coach would never put a player out on the field if there's a higher risk of him getting injured. There's no way in heck I'd do it."

The Jets are calling it a "mild" concussion, but Revis still must satisfy NFL protocol before he's allowed back on the field. A player with a concussion must be cleared by the team doctor and an independent neurologist before he can practice or play.

My two cents: Sit him. Revis is a franchise defensive player, and the last thing you'd want to do is risk his long-term health.

KERLEY UPDATE: WR/PR Jeremy Kerley, who missed Wednesday's practice with a stiff lower back, is expected to play, according to Ryan. How much he practices for the remainder of the week remains to be seen.

STEEL CURTAIN: On Wednesday, safety LaRon Landry claimed the Jets have better personnel on defense than the Steelers -- a bold statement, considering the Steelers were the No. 1-ranked defense last season. Ryan tried his best to soften Landry's comments, going out of his way to praise the Steelers and their defensive coordinator, Dick LeBeau.

NIGHT TRAIN RIDES AGAIN: The season is only one week old, and already Landry is receiving lofty praise for his hard-hitting style on defense. Ryan, known for hyperbole, compared him to Hall of Fame CB Night Train Lane, who played from 1952 to 1965.

"I'm going way back -- I never saw this guy play -- but I've seen video clips," Ryan said of Lane, legendary for his physical play. "That would be the guy I compare him to a little bit."

Ryan said Landry brings a "bad-ass" attitude to the field. Ryan said he looks for a specific criterion when evaluating defensive players, but it's not anything you'd hear from Mel Kiper on an ESPN draft show.

"I always want guys on my team you wouldn't want your kid playing against," Ryan said.