Dortmund manager Niko Kovac: "At the moment, in this tournament, we see that the South American clubs have a big advantage because of the conditions, the heat. "For the spectators in the stadium, it's incredibly hot. So you can imagine how difficult it is for the players. It's 32 degrees in the shade, so imagine in full sun, inside the stadium, you have to add 3, 4 or even 5 degrees. "It's very difficult, especially for Europeans. It's not excuses, it's just an explanation... This is very difficult, especially for Europeans. For the South American players it is easier because they are used to these temperatures."