Mexico are already down key defensive midfielder Jose Vazquez due to suspension, and now they're without one of their key defenders too. At the end of the first half against the Netherlands, Hector Moreno was involved in a tangle with Arjen Robben and teammate Rafael Marquez, and has been replaced by Diego Reyes.
It's not clear what Moreno's injury is, except that it's something to his lower body that made it impossible for him to leave the pitch under his own power. Moreno appeared to grab the lower part of his left leg after a challenge on Robben. He was sitting up and responsive, but obviously needed some help coming off.
While Reyes has played both the left and right central defense spots for Mexico, he's practiced more on the right than the left. Coming in for Moreno, he'll be occupying the left central defense position. The 21-year-old has been thought of as a star of the future for Mexico, but he's not in the starting lineup for a reason -- veteran 'Maza' Francisco Rodriguez, despite all his deficiencies and poor club form, has outperformed him over the last couple of months.