Even though its expensive, and probably not the most important type of player required by the team, I can see why Roman would go for him. There's no certainty over who among Hazard, Marin, Oscar, Josh or Piazon is going to become a mainstay and solve our problems regarding creativity. The club will most likely evaluate each of their performances this season, and decide who to keep next season. In short, this is just phase one of Chelsea's revival.