Grant wasn't spotted on the field during the early portion of Friday's practice, Joe Schad of The Palm Beach Post reports.
The Dolphins haven't revealed whether Grant's absence is due to any sort of health concern, but it's worth noting that the Dolphins have had an illness going around the locker room this week. In the even that Grant were forced to miss any time, Noah Igbinoghene and Preston Williams would likely be in line to fill in for him on kick and punt returns, respectively.