Newcastle can't win here. Isak is a superb player - he's the kind of player who can give them a shot at going for the title, FA Cup etc. If he goes to Liverpool, it makes them favourites to win it for me.
Also, if Isak doesn't get his move it sends a message to other players who see clubs like Newcastle as 'springboards' - join us and we will stop you going to the likes of Bayern, Real, Barcelona and even rivals like Liverpool. I know for fans we don't like it, but players like Isak don't care a jot about which club they play for - they want money and medals and Newcastle have a small outside chance of medals. Liverpool could - potentially - offer him the PL, CL etc plus a wage to match.
That said, Newcastle have been held over a barrel. If Isak had said to them he wanted to leave in June they might've been able to wrap up a couple of deals first to let him go. As it stands, there's likely to be no one available.
One thing we've done really well is let any unhappy player leave without any problems and I think it's the best way to handle it. Players know if they come to us and it doesn't work out, we won't stand in their way and won't get arsey with them.
Personally, I hope Newcastle keep him and they nail Liverpool but I can't see it to be honest.