Appeal of the four-game suspension for Seahawks cornerback Richard Sherman will be held Friday, two days before game vs. SF.

— Adam Schefter (@AdamSchefter) December 17, 2012

Cornerback Richard Sherman will have a hearing regarding his positive test for a banned substance on Friday, according to ESPN's Adam Schefter.

There is no timetable for a ruling on that case, and while Schefter subsequently stated that if the test result is upheld, Sherman could be suspended immediately, it's worth pointing out the NFL generally imposes a suspension at the beginning of the week and not two days before a game.

There's no hard and fast rule on the timing of a suspension, but that is the general guideline.