Bush never suited up for Arizona, sitting out last weekend's loss to Atlanta. His status for Sunday's game against Kansas City was in flux after coach Bruce Arians wouldn't commit to playing him.
"We'll wait and see," Arians responded Friday when asked what could be expected from Bush against the Chiefs.
Asked later what would keep Bush off the field, Arians said "just not being ready."
Before the Cardinals signed him Nov. 25, Bush was a free agent working out and living in Arizona. He played for the Chicago Bears last season.
In addition to Bush, the Cardinals also released tight end Matthew Mulligan to make room for outside linebacker Matt Shaughnessy, who was reactivated off injured reserve/designated to return, and Kerwynn Williams, who was promoted from Arizona's practice squad.
When Bush spoke to the media Wednesday, he said he was anxious for Sunday.
"I kinda (feel) like an Allen Iverson moment -- this is practice and stuff," Bush said. "You know, a game is more physical contact, you get tackled, you really get a feel for somebody bringing it to you. So I've been looking forward to Sunday."
Bush said practices with Arizona were "easier than my workouts."
Midway through the week, Bush believed he had a chance to play Sunday.
"As of now, I'm always saying I'm going to get on the field," Bush said Wednesday. "(Arians) calls the shots. Whatever they decide I just got to know and make sure I'm ready for it."