Demarcus Robinson's 49ers regular-season debut might have to wait -- the San Francisco wide receiver was hit with a three-game suspension for violating the league's substance abuse policy.
Niners head coach Kyle Shanahan confirmed the punishment on Wednesday ... but it shouldn't come as a surprise after the 30-year-old wrapped his DUI case last month.
As we previously reported, Robinson -- who was a member of the Los Angeles Rams at the time of his Nov.