Section 4: Players & Officials

Under Law 3.1, a match is played between two teams each consisting of a maximum of fifteen (15) players. A team may start a match with fewer than fifteen players only with the agreement of the opposing team.

Source: Law 3, Law 3.1, Law 3.3, Law 3.4, Law 3.5, Law 3.7, Law 3.6, Law 3.9, Law 3.10, Law 6, Law 6.1, Law 6.2, Law 6.5, Law 6.6, Law 9

Send this to your friend — argument over.