Joe McKnight walked into the New York Jets' offensive meeting room, and coach Rex Ryan broke the news to the backup running back.

"He said I've been traded," McKnight recalled Wednesday. "I was traded to the defense."

McKnight will start working "a ton" at cornerback to help offset the loss of All-Pro Darrelle Revis, who's likely out for the season with a knee injury. McKnight, whose role on offense has been limited this season, played the position in high school and practiced at cornerback in Week 2 when Revis was sidelined by a concussion.

Still, finding out about his new role this week wasn't exactly an exciting moment for McKnight.

"I mean, I was drafted as a running back," the former USC star said. "The way I took it was I wasn't good enough to play running back. I don't know if that's the case or not, but that's the way I'm looking at it right now."

McKnight didn't ask Ryan if that was the situation, and insisted he's not disappointed. After all, it could mean getting on the field a lot more after carrying the ball just three times for 14 yards in three games.

"I kind of get tired of just standing on the sideline watching," McKnight said. "I'm just happy to play right now."

McKnight practiced on defense Wednesday and intercepted Mark Sanchez, Tim Tebow and Greg McElroy once each.

"He'll have a role on offense, but we're also teaching him to play corner in almost, not quite a full-time capacity," Ryan said.

The Jets host the 49ers on Sunday.

Cardinals: Running back Beanie Wells will miss at least seven games because of a severe turf toe injury sustained Sunday against Philadelphia.

Wells was placed on the NFL's new injured reserve/designated for return list. That allows him to return to practice Nov. 7 and to play in the Cardinals' home game against the St. Louis Rams on Nov. 25.

The injury will leave the bulk of the running game load on second-year pro Ryan Williams, who had been splitting time with Wells.

Browns: Wide receiver Mohamed Massaquoi will miss Thursday night's game against Baltimore because of an injured hamstring.

Bears: Running back Matt Forte said he expects to play Monday night against Dallas after missing a game because of a sprained right ankle.

Redskins: Running back Roy Helu Jr. (San Ramon Valley High) was placed on injured reserve.

Fines: The NFL fined New England coach Bill Belichick $50,000 and Washington assistant Kyle Shanahan $25,000 for their conduct toward replacement officials.