The eight men and a woman appeared before magistrates in Milan after a brawl between groups of Welsh fans erupted in the city centre last Friday evening.
Beckham's injury soured Milan's eventual win, achieved with just 10 men as all three substitutes had already been deployed before the former Manchester United midfielder was forced to limp off.
Former Valencia coach Benitez had been linked with Real Madrid and Juventus in recent months, but with both those clubs now having new men in charge he could be in the running to fill the vacant position at European champions Inter Milan following the departure of Jose Mourinho.