Peterson's appearance on game day would not be a surprise. He has been listed as probable and Coach Jim Fassel said Monday he expected Peterson to return. But Allen was listed as doubtful. And he didn't practice Wednesday, the first day of the work week.
His prospects are now much brighter.
"He practiced and he said he feels fine," Fassel said. "We'll just have to see. But it was good to see him out here. He picked off a couple of balls. I told him, 'I think you've been faking it on me the whole time.' "
On Monday, Allen had trouble lifting his arm above his head. Now he has full range of motion. He credits the team's training staff, particularly assistant trainer Byron Hansen, with hastening the healing process.
"Fast recovery - very fast," Allen said. "I wasn't supposed to be back, but anything can happen, I guess. It felt good out there today. I'm not surprised. I've been trying to get out there. With the help of the training room, I did.
"There's some miraculous stuff going on. I'm serious. One day I can't lift it, the next day I can lift my arm. I'm just a fast healer, that's all."
Peterson said two idle weeks have helped him recover from his concussion.
"I feel good," he said. "I'm on track to play. I'm close to 100 percent."