Green Bay Packers rookie Randall Cobb listed his prognosis as "day to day," but when asked whether it was a given he would be ready for the regular-season opener, he couldn't answer yes.

It might be that it's just difficult for Cobb to know how quickly he'll heal, but his doubts also might indicate the severity of his injury. He is listed as having contusions to both knees after getting slammed during a kickoff return Friday night against the Arizona Cardinals.

When asked whether he had bruises on both knees, he said, "It's an injury. But it won't be anything that will hinder me and (make) me miss a lot of time. We're taking it day by day right now and trying to get better each day."

Cobb is expected to be the team's punt returner when healthy and also could serve in the kick-return role. Running back Alex Green is also a candidate for the kick-return job.

The team's second-round pick was at practice Tuesday and appeared to be walking a little gingerly. Cobb said the injury was unusual because of the way he got hit and the way he landed.

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