Cardinals running back D.J. Foster is done for the year. On Monday morning, doctors diagnosed Foster with a torn ACL, according to Ian Rapoport of NFL.com (on Twitter). 
Foster came to the Cardinals last September after he was signed off of the Patriots’ practice squad. He didn’t play a whole lot in Arizona, but he was quietly impressing this offseason with his versatility.
The Cardinals were facing some tough choices at running back, but the injury clarifies their depth chart somewhat ahead of Saturday’s deadline. Fourth-round pick Chase Edmonds, T.J. Logan, and Elijhaa Penny are still fighting for jobs behind David Johnson, but it’s possible that the Cardinals will keep all three on the initial 53-man roster. Although the Cardinals have other running backs on hand, Foster’s special teams skills will be missed.
Foster had 59 receptions for 584 yards as a senior at ASU and the Cardinals were hoping to see some of that pass-catching acumen in 2018. Last year, Foster had 17 catches for 133 yards in seven games.
First we lose our center now we lose him. The hits keep coming and the season hasn’t even started yet
And if history is any indication then Bradford will probably only last a few games before an injury ends his season.