The long-awaited returns of tackle Derek Sherrod and defensive end Jerel Worthy from major injuries could be pushed back to 2014 because the Green Bay Packers have a glut of healthy, capable players at their positions.

Sherrod, a first-round draft choice in 2011, and Worthy, a second-round pick in 2012, are two of the four players on the team's physically unable to perform list.

The Packers began Sherrod's three-week practice window Oct. 17. By mid-week, they must activate him to the 53-man roster, keep him on PUP for the rest of the season or release him.

None of the starting offensive linemen have been injured, and Marshall Newhouse seems entrenched as the No. 3 tackle. Rookie guard Lane Taylor could be vulnerable but Sherrod hasn't played guard since August 2011.

Friday was Sherrod's second day in pads, and in the portion of practice open to reporters he moved adequately but wasn't getting much movement in the half-line run-game drill.

"He's moving around well," offensive coordinator Tom Clements said. "For having such a long layoff he doesn't appear to have as much rust as you might expect. It's just a credit to him that he's come back to this point."

Sherrod is 22½ months removed from emergency surgery to repair a broken tibia and fibula in his right leg.

"He seems to be moving fine," said defensive end B.J. Raji. "It's funny. Every time I see him out there I get nervous because of what happened. I'm always saying, 'Stay away from his legs.'"

Defensive end Datone Jones went nose-to-nose against Sherrod for the first time.

"He's a real finesse guy," Jones said. "He's really good with his feet. Really quick. He's actually stronger than I thought he was. I think he's really good.

"His power's there. I feel like he could go if they really threw him out there. Right now it's just him actually getting a feel for the game again. You come off a break, you pretty much have to trick your mind. It's about pushing through it."

Meanwhile, the Packers have yet to open Worthy's three-week practice window in order to give him maximum healing from his reconstructive knee surgery of Jan. 15. He has until Nov. 18 to start practicing.

The Packers are carrying seven defensive linemen, none of whom has been injured. They certainly wouldn't want to cut one because of the need for bodies in 2014. Four of the seven will be unrestricted free agents in March.

"This league is all about numbers," Raji said. "As good as Worthy is when he's healthy, I don't know who you would say would be the swap."

Rookie defensive end Josh Boyd, a fifth-round pick, has played the fewest snaps (10) but the coaches like his potential.

Worthy is trying not to become frustrated amid the very real chance he won't get to play until next season.