LAST WEEK'S disappointing loss to Milwaukee still has Soul coach Doug Plank fuming and the general manager working the phones.

"Everytime you lose," Plank said following Thursday's practice, "there is an opportunity to make changes."

The Soul traded a defensive starter for a d-back, added a free-agent defensive lineman and will rotate their kicker once again.

Justin Warren, who registered 12 sacks over the last two seasons for Dallas, is the free agent.

"He's a very active player," Plank said. "He gets off the ball fast and is full-time effort from when the ball is snapped until the play is over. If he has to run down the field to make a tackle or break up a play, he'll do it. That energy is contagious."

The Soul uses much of the same playbook terminology as Dallas, which should help Warren's transition. Familiar faces also should help.

"I always knew Philadelphia had a great organization. They have a reputation around the league," Warren said. "[Soul assistant head coach] Clint Dolezel was my coach last year and the guys I played with last year, we created a bond. It seemed like the right place for me."

Tom Goodhines, the team's GM, traded defensive lineman Darrell Campbell to Chicago for defensive back Brandon Freeman. And with Phil Marfuggi again hampered by a sore left hamstring, so Connor Hughes will do the kicking.

Freeman will not play when Jacksonville visits the Wells Fargo Center on Saturday, but Warren will.

Contact Ed Barkowitz at barkowe@phillynews.com