A classic 'Club versus Country' dispute has arisen involving players from the Brazil national team, but what's it all about?
An unusual scenario has transpired whereby a number of Premier League clubs find themselves at odds with the Brazil football association (CBF) and other South American associations.
Liverpool, Manchester United, Manchester City and Chelsea are among the high-profile teams that will potentially be affected, with the national associations invoking a FIFA rule to prevent players from playing.
So what exactly is the rule, which players are at risk of missing out and why has the entire saga developed in this way?