Source: Darin Gantt, NBC Sports 
The league announced the suspension moments ago, citing “a repeat violation of NFL safety rules prohibiting hits to the head and neck area of defenseless players.”
Griffin teed off on Raiders TE Mychal Rivera yesterday, knocking Rivera’s helmet off and out of the game.
Griffin’s suspension was handed down by NFL Vice President of Football Operations Merton Hanks.
He’ll have a chance to appeal before either Matt Birk or Ted Cottrell.Michael Griffin Suspended For Head Shots Against Raiders by Charles Mager