Chelsea fans will surely be worrying that Diego Costa's repeated hamstring injuries at the end of last season haven't taken the edge off his game.
The game against Chile was his seventh without contributing a goal, three of which have been for Spain since the season ended.
The fact he is clearly not fit yet still playing is a risky, and damaging business, and who knows what the relapses in the Barcelona game and Champions league final with Real Madrid will have done to his legs.
Fernando Torres came to the Blues from Liverpool with his pace and confidence permanently damaged after a series of niggling injuries at Anfield, and the similarity between the two player's abject performances in Brazil indicate that if, or when Costa moves to Stamford Bridge, he will not be in the kind of form or at possess the confidence he had for much of last year's La Liga season.
What's more, Costa's decision this year to switch allegiance from Brazil to play for Spain at international level looks like being one of the most regrettable decisions any player has ever made.
It has already cost the World Cup holders the chance of a sustained defence of their trophy, with the tiki-taka style not sitting well with Costa's bustling, direct approach. The fact Del Bosque and his side didn't get the chance to develop it in sufficient friendly matches only highlights the desperation it reeks of, especially considering his injuries.
For Brazil, it robbed them of the one natural target man that could have worked with Neymar, with Fred and Jo failing to impress in either of their group games so far. Who knows how far they will get relying on the Barcelona youngster's brilliance alone.
And of course Costa himself suffered the ignominy of returning to his home country a villain after the snub, rather than the hero he would have surely been had he stayed with Brazil.
The player may have personal reasons for his choice, and who are we to question them, but even he may be wondering whether he made the right choice given Spain's exit.
While Jose Mourinho, he may just be reconsidering whether the Atletico forward is still worth that £32 million.