Since Costa is out we should go 4 in midfield. Pjanic, Matuidi, Khedira will start so add into that Rabiot and I think we should boss possession and be solid defensively. If we need to get the goal later we swap in Ramsey. It's a safe strategy but I don't see how Berna will help us, rather Cuadrado plays because he can track back and tackle if its a 4-3-3.