The problem with Mikel is that he sucks in the air. Like really sucks. Luiz has only been out for a couple of weeks, it's not that he forgot to play football during that time and he has to play sooner rather than later so why not get him going? Luiz would be very good in a game like this. He can defend, he can pass from the middle, he can score from set pieces and he can blast them in from freekicks. Mikel is just.. I don't know....