A few decades back, teams like Brazil and Argentina were ahead of the other teams in terms of quality of play. But this gap has disappeared now. Also, the local leagues in these countries are not of high quality and therefore the players opt to play for European leagues. This is having an impact on team bonding, as nowadays the players remain with their club for almost the entire year. International matches are given a low priority when compared to club matches and even while participating in national matches the players are very cautious to avoid any injuries.
Corruption and economic problems is affecting the Brazilian and Argentine leagues. Some of the clubs that were able to afford competitive salaries like the European leagues are not that buoyant to continue with such payments. Recently there was a big corruption allegation against teams in the Brazilian Serie B. Investigation revealed that this corrupt practice have been going on for a long time and the football regulatory body did nothing to curb it. The financial issues and corruption has led to the decrease of sponsorship and endorsement deals. Brazilian national team is now made up of mostly foreign based player and it is affecting the team negatively. Due to the difference in football leagues it will also take more time for the players to blend and understand each other. Even in my country's national team, the players are more serous when playing for their clubs than the national team. This is because the clubs treat the players better than the national team. Sometime players are even abandoned when they are injured. So the drop in the performance of the national teams of Brazil and Argentina might be because of poor administration.