They'll do what Roma do and sell someone like Kovacic or Icardi, it's not really building, but it's a calculated risk which requires regular CL football to prevent further sales. When you consider that there is Juve, Roma, Napoli, Milan, Lazio, Fiorentina and the seasonal upstarts (Sampdoria, Verona etc) also trying to fit into 3 CL spots it's a real risk, but I suppose Inter have to do it or settle for being just a top 6 side.