A troublesome shoulder nerve for Carson Palmer was "woken up" by a muscle specialist over the weekend.

Greg Roskopf, the founder and CEO of Muscle Activation Techniques, made "significant progress" during a weekend of treatment on Palmer, who has been out since Week 2 with the nerve issue.

Palmer was able to throw 40 to 50 passes on Tuesday.

Palmer's chance of returning Sunday remains very much up in the air. 

Drew Stanton or Logan Thomas would start for the Arizona Cardinals if Palmer is unable to play. Stanton is currently on concussion protocol.