They had their eyes on him for "a long time," Cardinals coach Bruce Arians said, and tried him out twice. But Bishop is coming off a torn ACL and torn hamstring suffered in consecutive seasons. The timing wasn't right until Thursday.
By signing Bishop -- who Arians said will be playing at inside linebacker -- to a one-year contract Thursday morning, Arizona adds depth to its thinnest position. Bishop, however, has played just four games in the past two seasons. He tore his hamstring in the 2012 preseason opener while with the Green Bay Packers and tore his ACL last season with Minnesota in October.
"We got to go out and see how it goes right now," Arians said.
Bishop said he's 100 percent "feeling good" but needs to knock some rust off.
"Of course, it's a process," he said. "But at the end of the day football is football. I've been playing since I was 8 years old. At the end of the day I don't think it really matters."
Bishop had 115 tackles in 2011 and 99 in 2010, when the Packers won Super Bowl XLV. He recovered a crucial fumble by former Cardinals running back Rashard Mendenhall in that game. His 2011 season also included a career-high five sacks.
But that was three years and two major injuries ago and Bishop wasn't sure if he'd ever get another call.
"It felt good to finally get a call," he said. "I can't lie, sitting at home sometimes you have doubts."