Ordinarily, I would agree with those who argue that we should stick with the same squad and buy just 2 world class players to buttress it. I mean, we're only 3 points out of what next year would be a CL place. Besides, there are any number of Premier League teams whose underperformance has shown that mediocre players who know each others' moves by heart can often outplay world class talents who barely speak the same language.
The problem is, though, that we can't stick with the same squad - at least, not without paying for it. Even if we keep Deolofeu and Pasalic, we'll have to pay for them. Then there's the DSG situation; if he leaves for 15m, we'll probably have to either pay 25m for the likes of Bernat, or gamble on the likes of Barreca. Then there are the bench players who haven't done much this season, but who still provide options in case of injury: Ocampos, Poli, Honda... Plus we also need backup wingers because B&G set up the team to play 4-3-1-2. Put all of those together and we could easily wind up spending half our transfer budget just to stay in the same place. And that's without mentioning Mussachio, which seems to be a done deal.
Add all of that up and it's easy to see why we're being linked with Fabregas and Kalinic instead of Verratti and Belotti.