Who is a libro in soccer?

Answer 1

In football (soccer), the libero, also known as a sweeper, is a defender who typically plays behind the other defenders. The libero serves as a last line of defense, and also will often trigger attacks. The position was first developed in Italy, but the modern role was largely defined by German legend Franz Beckenbauer. Source: http://www.spiritus-temporis.com/libero/football-(soccer).html

Answer 2

a libro can be anyone. the libro must wear a different coloured jersey for the umpire 2 differentiate easily whose the libro