Smythe (knee) didn't practice Wednesday, Josh Tolentino of The Athletic reports.
Miami's backup tight end is coming off a solid two-catch, 30-yard performance against the Seahawks in Week 4, but he may have picked up a knee injury along the way in that one. It's also possible that this was just a routine day off, and Smythe's practice participation in the coming days should help us form a better idea of his status for Sunday's trip to San Francisco.