edit request on april the article states that only one libero player is allowed per team however beginning in for fivb competitions and beginning in the for usav competitions two liberos are allowed per team although only one may play at a time in fact fivb rules require two liberos to be designated if a team has more than players on the roster fivb refernce usav reference the article also states that the rule allowing liberos to serve has trickled down to juniors competitions that is not entirely true usav rules do not allow liberos to serve in any sanctioned event although aau volleyball does allow liberos to serve many usav regions allow liberos to serve in events that do not serve as usav national qualifiers