Since friendly games are not important in FIFA ranking the players must play the game with caution. It will be needless for players to pick injuries because of an unimportant game. But some players take this game seriously because it contributes to players’ goals and caps. So a player that wants to break a record or wants more caps will play his best in the game just to achieve his aim.
Every player must avoid injury in a friendly match because it is not a very serious match. The main purpose of a friendly match is for fun, not for winning a prestigious title. Players show up their abilities/skills in a friendly match, but they will play not seriously. So, we rarely saw top players play full-time in a friendly match, most players should be the substitutions. It is only important for substituted players, it is the time to show that they deserve to be selected as main players. In this matter, top players won't target for goal or caps achievement in a friendly match.
Some teams are natural rivals which makes them take friendly games between them seriously. There has been an old rivalry between Brazil and Argentina, Nigeria and Cameroon, and some other examples. In such friendly games, national interest is of great importance. So the player will give thier best because of pride and records.,
Sure. When it is about rivalry, the match should be more serious. Players will try to win the match because it is for their pride or self-esteem. But since it is a friendly match, it shouldn't be as serious as in the real match.