Ernesto Valverde has his second homecoming this week as he visits his former club, Olympiacos, in Greece. The manager has a chance to secure a berth in the knockout stage for Barcelona. With that in mind, here are three things he needs to do against Olympiacos:

1. Play 4-3-3

The last time Ernesto Valverde faced Olympiacos, he had all the time in the world to build attacks from the back despite playing with ten men. The Greeks will not be as quiet at home, but their obvious intimidation is a major loophole waiting to be exploited.