They haven't spent anything at all, mate. I wasn't aware of this either, but, when you're forced to sell your best player for a 9 figure sum, then use that money to buy a keeper and a centre half, it doesn't count as spending, and nor does it count as spending for any of player you acquire for money, after that (or even well before that according to some). It's quite incredible.
They didn't buy their keeper or centre half. Or anyone else. All their players are from a 30 mile radius around Anfield and academy trained.