Brazil.
There is no official language on a soccer field. It doesn't matter what language the players and referees speak as long as they all know and understand the rules in their own language.
Most of the Spanish-speaking soccer (football) players in the European league are from Spain. Although there are also many players from Brazil, the native language of that country is Portuguese.
In portuguese (language spoken in Brazil) "soccer" is called: Futebol
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The most popular sport in Portugal is football (soccer). However, some Portuguese beach soccer players, volleyballers, rink hockey players, cyclers and Track and Field athletes are known worldwide.
English for some reason.
There is no expectation of any official language for international matches. Referees are able to communicate required information using the whistle, standardized hand and flag signals, and yellow and red cards. The Laws of the Game, the document that governs soccer worldwide, uses English as its official language, but that does not mean that it's the official language of soccer or of any particular match.
11 players on the pitch for each team at one time, three substitutes may be used.
In an official match they have to have numbers, so that players can be identified. If players are just practicing or fans are buying shirts, then they don't have to have them.
Cristiano Ronaldo would be the most famous Portuguese soccer player. Some others include Deco, Quaresma, Nani, and Ricardo (goalie).
"Roupeiro" in Portuguese refers to a wardrobe or a piece of furniture used for storing clothes.