From the video

Video: The Week 2 Injury Fallout Leads to the Week 3 Waiver Wire
The read on Saquon is that it's not overly serious, but you never know. Something can come back throughout the week like it could aggravate or flare up the stinger.
Mentioned at 0:54 – 5:31Captured by STACKED 5 hr after posting

STACKED’s take

NeutralInjury

Barkley is dealing with a shoulder stinger that is not considered serious

Saquon Barkley sustained a stinger to his shoulder; while the injury is not considered overly serious, there is a possibility he could miss a game if the stinger flares up during the week.

Saquon Barkley headshotSaquon BarkleyRB · PHIPlayer page — value, ADP, projections, and every insight