Rossum suffered a medial collateral ligament tear in Thursday's win over the Lions at the Pontiac Silverdome. The absence of the return man/defensive back sets back the Packers' dual needs of filling injury gaps in the secondary and pulling their return team rank up from their last-in-the-league status.
"Right now we're looking at guys we could bring in," Sherman said Friday. "It's up in the air right now."
Wide receiver Antonio Freeman is one candidate to handle return duties, Sherman said. Freeman served a stint there when Rossum missed four games earlier this season with a pulled hamstring.
"Free can give us the catch, and we know he can secure the ball," Sherman said.
The opening may also provide an opportunity for the thus-far disappointing rookie Robert Ferguson. A second-round draft pick, Ferguson has not been active in the team's 10 games.
Sherman also tabbed Charles Lee as a possible return man.
Thursday's game may leave Rossum feeling jinxed againstthe Lions. He was injured in the Packers' season-opener vs. Detroit at Lambeau Field, and sat out four weeks. Rossum, secured in a trade with Philadelpia last season, has returned 23 kickoffs for 431 yards, and 11 punts for 109 yards.