Unless Thohir decides to give a ‘gift’ to the club, major purchases at this time can only come through a significant sale (Guarin or Ranocchia). Sunday Ausilio tried to play down a move for the Colombian, while admitting contact with Chelsea. The Blues have problems related to Financial Fair Play in January and first they must dispose of some of their unwanted players. This could wait until June and is why Matic from Benfica currently looks is so far away from Mourinho’s grasp.
Source: Corriere dello Sport

Since when has Chelsea cared about FFP?
Teams that have their budget in balance don’t have to care about FFP. Chelsea didn’t have to care earlier seasons because their financial situation was better. After years of spending they have now reached a point where they have to sell before they buy to avoid red numbers in their budget. So, Inter aren’t the only team that care about FFP.