Breaston had expected to return last weekend in Seattle, but he was held out because of the wet conditions. He has missed three games following arthroscopic knee surgery.
Whisenhunt also said Thursday that he is considering activating inside linebacker Gerald Hayes and rookie outside linebacker O'Brien Schofield. Both have been out all season, Hayes following back surgery and Schofield after reconstructive knee surgery.
Starting outside linebacker Clark Haggans hasn't practiced this week because of a groin injury. If Haggans can't play, his replacement would be second-year pro Will Davis, who played 24 snaps in relief in Arizona's 22-10 loss at Seattle.
"I've been preparing every week the same way, like I'm one play away," said Davis, a 2009 sixth-round draft pick out of Illinois.
Breaston said he was tired of talking about his injury situation but, nice guy that he is, did so anyway.
"It's tough, but it comes with the game," he said of missing so much time. "I was looking forward to being back last week, so that's disappointing. I just want to play some football again."
Breaston was injured at Atlanta in the second game of the season, but he tried to play through it the following week against the Oakland Raiders. That's when the decision was made to scope the knee.
"It's sore, but that's expected," Breaston said. "I felt good out there running. I'm getting my speed up, getting my burst together. I'm really ready to play on Sunday."
Breaston has 132 catches for more than 1,700 yards the past two seasons and has been sorely missed by an Arizona offense that ranks last in the NFL and has an undrafted rookie, Max Hall, at quarterback.
"You've got a veteran guy that's made a lot of big plays for us that you have confidence in," Whisenhunt said. "I know Max got a number of reps with Steve in camp, so there's a comfort factor there. It's always good when you have a player like Steve come back. That can only help us."
Hayes and Schofield started practicing just last week. If either is activated, it would require a roster move.
Hayes is a four-year starter who had been on the physically unable to perform list.
"We're working him in," Whisenhunt said. "He's got a couple of packages that he's playing in, and I think he's pretty close to being ready to go."
Schofield said he believed he might miss the entire season.
"But they gave me an opportunity to come out there and practice, and I was like, 'Man, it felt good,'" he said. "I got hit on the knee a couple of times, and I kind of paused and thought about it -- 'OK, no pain.' Everything feels good."
Copyright 2010 by The Associated Press