Exceptional Substitute
 

USAV Rules.

In both scenarios, the team has 8 players, and lists players #7 and #8 as their liberos, with the lineup consisting of players 1, 2, 3, 4, 5, 6. During play, while #7 is on the court for player #1, #3 becomes injured and cannot continue.

Scenario 1:
Libero 8 has not yet played in the match at the time #3 is injured.

Scenario 2:
Both Liberos have played in the match at some point in the match when #3 is injured.

In either scenario, does the coach have any options as to who can go in to replace number 3? If not - who must go in to replace number 3?

In Scenario 1, #8 is the only option. In Scenario 2, either Libero can be used. If choosing #7, #1 must return to the court, and in both scenarios, allow a reasonable amount of time to change uniform jerseys.