Barca have no money but neither do many clubs outside that also prioritise in many ways, hence making it difficult for Barca to make money. Won't be so hard with the likes of Dembele or Coutinho next summer when it'll ultimately be easier for Koeman to freeze players out and make them leave as there will be those who will have the means to take them off you and take a chance on them.
Right now Lukaku to Chelsea would be a brick in the wall for rebuilding La Liga.
Serie A wont compete for Haaland. Or I struggle to believe they will, even if Juve moves on from Ronaldo
That leaves Manchester teams one of which will have to settle for a non-Haaland striker anyway
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Liverpool, who will be breaking up the trident possibly looking to battle for Mbappe-Haaland signature
PSG (who Haaland wont likely be interested in unless mad for money)
Bayern, if Haaland likes it in Germany, couldnt care less about big big leagues, but wants some trophies