"Hopefully it's just minor injuries," McCarthy said.
Fourth-year pro Kenderick Allen took Pickett's place with the first-team defense during practice in Pickett's absence.
Wide receiver back in action
Robert Ferguson returned to practice today after missing Friday evening's practice with a sore back. Ferguson made a couple of impressive catches off deep passes.
Ferguson, entering his sixth season, is squarely on the bubble in training camp. Prone to injuries in recent seasons, he must prove that he is durable and can contribute to the offense.
"Yes, but who doesn't?" McCarthy said. "I know what his history has been here. I really liked Robert when he came out of Texas A&M. He was very raw coming from a junior college and only playing (at Texas A&M) for one year. I thought he did a lot of exciting things in the spring. It's time for him to step up. He's comfortable with what we're doing. As far as running the football and the play-action game, he definitely will be a factor in that, too."