LATROBE - Steelers first-round draft pick Maurkice Pouncey sat out the team's only practice with a hamstring injury, as did rookie running back Jonathan Dwyer.
Guard Ramon Foster was held out with a concussion but could resume light workouts as early as today.
Neither Pouncey, a center who is being tried at guard, nor Dwyer, a sixth-round pick, is expected to be sidelined long.
Maurkice Pouncey interviewed at training camp
During Sunday's two-hour practice, running backs took on the linebackers in blocking drills and all four quarterbacks took part in the two-minute offense.
For the second successive day, quarterback Ben Roethlisberger spent considerable time signing autographs at the end of practice.
Meanwhile, kicker Jeff Reed isn't happy after learning he won't be signed to the multiyear contract he expected after being designated as the team's franchise player.
The Steelers told Reed earlier in the year they wanted to work out an extended contract. Any chance that deal would get done apparently ended when right tackle Willie Colon was injured in June and Flozell Adams signed a two-year contract to replace him.
Reed, who signed a one-year deal for $2,814,000, plans to explore his options after playing out the season.
Reed has played in Pittsburgh since signing as a free agent midway through the 2002 season and is the ninth-most accurate kicker in NFL history.