Clarifying lineup rules

I need to provide context about the lineup rules for the Spanish Copa del Rey. It looks like there’s a requirement that teams must include a minimum of seven first-team registered players on the pitch. This rule also seems consistent across other competitions like LaLiga and the Spanish Supercopa. The user mentioned “只能用3名青训球员,” which implies only three academy players can be used, aligning with the idea that a maximum of four reserve players is allowed on the pitch.Clarifying player rules in La Liga and Copa del Rey

So, the common rule in La Liga allows a maximum of four players from affiliated teams on the pitch. In the Copa del Rey, it seems that the same applies. The RFEF states each team must include at least seven first-team players, meaning that the remaining four can come from non-first-team players, allowing up to four. The user's mention of "只能用3名" seems incorrect, as you can actually use up to four. However, there might be nuances, especially with teams like Real Madrid's Castilla in the third tier.Exploring Copa del Rey player usage and registration

In the recent 2023-24 Copa del Rey, many top teams started seven first-team players but might have used four academy players in their lineup. The user mentioned "马斯坦托诺," which seems to refer to "Mastantuono," a young talent from River Plate. There's also a mix-up with names because the Chinese transliteration could lead to confusion. It looks like "被登记在二队" indicates registration with the B team, possibly relating to players like Endrick, who joined Real Madrid in July 2024. However, Mastantuono might stay at River until 2025.Verifying registration rules and player implications

In 2024, it was reported that Madrid closed the deal to sign Mastantuono for 2025, but if he joins in January, he may first be registered with Castilla. The user's statement might be looking for clarification on whether only three academy players can play if Mastantuono is registered with Castilla. Generally, in Spanish competitions, teams need at least seven first-team players, allowing for a maximum of four academy or reserve players. If they're adamant about three, I need to clarify possible misunderstandings regarding player classifications or specific rules for the Copa del Rey.Clarifying registration rules and player limits

I need to address the RFEF General Regulations, particularly regarding player registrations. In the Copa del Rey, teams must start at least seven first-team players, allowing for a maximum of four players from the B team or youth squad. This makes the claim of only "three players" likely incorrect. If Mastantuono is registered with Castilla, he counts toward the four allowed. Additionally, non-EU quotas don't apply to Copa del Rey but do affect LaLiga. Would you like me to verify this further or help with a possible lineup?