The Cardinals need a running back and an ASU alum is on his way to help. Arizona has signed D.J. Foster off of the Patriots’ practice squad, as Ian Rapoport of NFL.com tweets. 
On Monday morning, the Cardinals learned that star David Johnson has suffered a dislocated wrist. Right now, the Cards are operating under the assumption that he’ll be out of action for approximately 12 weeks, meaning that he won’t be back on the field until December in a best-case scenario.
Foster missed the Patriots’ initial 53-man cut this year which wasn’t a huge surprise given their depth at the position. He signed on with the practice squad that same weekend, but it didn’t take long for another club to pry him loose.
Foster appeared in three games for New England last year. He totaled 24 yards off of seven attempts and also added one reception for two yards. His pass-catching ability may be his best quality – he had 59 receptions for 584 yards as a senior at ASU.
Forgot how this works in the NFL.
If a player clears waivers and is signed to a team’s practice squad and another team can still just sign him off of it anyway, then why does he even have to clear waivers to begin with?
If another team wants to put the player on their 53 man roster their able to snatch any player on a practice squad