NEW YORK (CBSNewYork) — This isn’t good.

Darrelle Revis will not be available for the Jets when they take on the Miami Dolphins on Sunday at MetLife Stadium, head coach Todd Bowles confirmed Friday afternoon.

The veteran cornerback suffered a concussion during the second half of last week’s loss to the Texans in Houston and has been participating in the league’s concussion protocol. The fact that he did not practice Friday was an ominous sign that he wouldn’t be suiting up for a game the Jets absolutely have to win.

New York (5-5) has lost four of its last five and now sits squarely on the outside of the AFC playoff picture.

Revis had perhaps the worst game of his NFL career last week against Houston as he was burned for a 61-yard touchdown by Texans wideout DeAndre Hopkins, who finished with five catches, 118 yards and a pair of scores.

MORE: Green Lantern: Revis May Be A Mere Mortal, But He’s Still Better Than Most

With Revis unable to go, the Jets will likely turn to youngster Marcus Williams, who has four interceptions this season, to start opposite Antonio Cromartie. Veteran Buster Skrine will remain in his nickel package role, Bowles said.

Perennial All-Pro center Nick Mangold, who suffered a hand injury last week, participated in individual drills on Friday and is probable, as is defensive end Sheldon Richardson, who missed the Houston game due to a hamstring injury. Safety Dion Bailey will not play this week due to an ankle injury, Bowles said.

Miami (4-6) has lost three of four, including last week’s 24-14 defeat to visiting Dallas.

The Jets beat the Dolphins on Oct. 4 in London, 27-14. Revis and Williams each intercepted Dolphins quarterback Ryan Tannehill once.