There's not a chance Isak is staying in the Premier League on a loan basis.
Newcastle will say they'd like to win the title, but realistically they will expect Liverpool to be favourites and us to be rivals for a second place finish. Doing any sort of loan deal would be akin to doing us a big favour. Not a chance it happens, and if it does I'd imagine it would have to be accompanied by a premium on the transfer fee so high that it just wouldn't be worth it.
And on outgoings to pay for it, there's nobody in the squad we could move on for a significant fee that I wouldn't rather have than Isak. Getting rid of someone like Saliba to finance an Isak deal is wrong for so many reasons.