Francois Nel: During knockout matches, it is very important to keep an eye out for off-the-ball incidents. Before the Switzerland v Serbia match, our editors briefed us to look out for key Swiss players Xhaka and Xherdan Shaqiri. They have Kosovar roots and, in 2018, both players scored and celebrated by forming a double-headed eagle with their hands - a reference to the Albanian flag. This vital information makes you more aware of what is going on. The ball went out of play and Xhaka and Milenkovic exchanged words, so I stayed focused on both players in case the situation escalated.