Bartomeu (sports vice president): "We already paid 10M for Neymar, and we will pay the rest in the next 3 years."
That means that 47 M of the 57 M (full transfer fee for Neymar) is going to be payed over the next years. That's rougly 15,6 M from THIS year's transfers budget (45 M). So Barca had 29,4 M to spend.
Add the 20 M or 25 M (whichever you want to believe) from a possible Thiago transfer, and Barca will have 54,4 M to spend this summer. Then there's the pathetic amount from the Villa transfer (2.1 M this season) and Fontas (1 M).
The budget is now 52,5 M or 57,5 M, which is more than enough to buy Thiago Silva, Marquinhos or another quality CB.
Next year's budget will be 29,4 M (45 M minus the 15,6 from the Neymar transfer). Enough to buy a replacement for Thiago, IF Sergi Roberto doesn't perform well enough this upcoming season.