Impossible to stack money with the pandemic. United who has a significantly higher revenue (and profits) lost money last quarter, probably Liverpool lost more. They are skint, and there is no way they will pay 100m for Sancho while making him top earner when he isn’t guaranteed a starting place (both Salah and Mane are currently better and reportedly on lower salaries than Sancho would ask).They have to be stocking up some money surely. They're being successful and have a good following, haven't spent a lot recently. They managed to break records to sign VVD and I wouldn't be surprised if they cash in on an older Mane or Salah eventually.
City might be a problem, Real and PSG too. Liverpool, not so much.