Changing formation before a big match like this is far from ideal. Players need some time to adjust. Luiz has a slight ankle injury. Won't get into why I think starting him the pivot in a game like this would be suicide. I am a fan of Marin, but he has hardly got any minutes, you can't throw him, in his second start in the PL, against Arsenal. Rafa would have been slaughtered had he done that. Point is, our squad is thin, atm. Any line up will look weak. Thankfully, their line-up is weakened as well. Let's just hope for the best.