The Cardinals waived Strong on Friday, Darren Urban of the team's official site reports.
This move comes as a surprise, as Strong has played well this season, recording career highs with 46 tackles (25 solo), including 2.5 sacks, over 14 games. He has dealt with a variety of injuries, including separate shoulder and knee issues that have caused him to miss time, but it's uncertain if those issues played a role in his departure. Roy Lopez could see more work Sunday in Strong's stead in the team's season finale versus Seattle.