I've been recommending Jonathan Stewart for a few weeks now, and his ownership has still been pretty modest, which still puts him in sleeper status for Week 17.
The Panthers need a win to make playoffs, and with the way Stewart has been playing, he should ride it out as the primary back like he has done recently.
Stewart is averaging 19.5 carries in his last four games, good for 109.3 yards, 0.3 touchdowns, and 15.0 half-PPR fantasy points.
Atlanta is dreadful against running backs, both per our metrics or per fantasy points against. Stewart is a prime play in the season's final week.