In Bradford, the Cardinals landed a steady veteran quarterback, though one who has had his share of injury issues.
A source told NFL Media's Ian Rapoport Bradford will sign a lucrative one-year contract, which contains an option for a second season.
Last season, Bradford played in just two games for the Vikings due to injuries in the same knee.
Look for Bradford to be the starter but it will be highly disappointing if the Cardinals were done at the position.
The mass exodus by the three quarterbacks is logical considering the Vikings are on the verge of signing Kirk Cousins to a three-year, $84 million contract. And if the Cardinals want him back in 2019, they'll have the ability to exercise an option on his contract for another $20 million.
Bradford, 30, was the 2010 first-round pick out of Oklahoma. It might not be quite as dire as the one Bradford surprisingly thrived working behind in Minnesota two seasons ago, but it's not that far off.
Bridgewater was expected to be Minnesota's quarterback of the future after being taken with the last pick in the first round of the 2014 draft. He also tore the ACL in his left knee as a rookie in 2013.
Bradford appears to be healthy, at least as healthy as someone who has gotten hurt as many time as he has, can. Case Keenum eventually assumed the role and led Minnesota to the NFC Championship Game.
In other roster moves, the Cardinals announced that they have released running back Adrian Peterson after a half-season in the desert that included a pair of impressive games and a season-ending injury.