4 feferees. The main referee, two line referees, and the 4th referee who controls the board for substitutions.
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4 are assigned to each match if that's what you are looking for. I'm not sure how many are employed by the FA in general though if that's what you're asking???
Howard Webb of England for Spain vs. Germany
Khalil Al Ghamdi of Saudi Arabia for Uroguay vs. Holland