To me Vidal's words are the most important here. And he was never incisive or conclusive in the sense he would remain, or would at least want to remain. He actually didn't stand for any position. He said he would be happy if he continues at Juve, but didn't exactly say he wants to continue.
Marotta is the same. He transfers all responsibility to players' will, which I don't like. The player has to be happy, yes, but the club also must have his requirements satisified. It's a 3 way negotiation, always. Saying that Vidal is staying, unless he wants to leave, is the same as saying nothing.
So basically, both Marotta and Vidal really kept their options open. With all the rumours, and mainly Chile's coach saying United wants him but Van Gaal is worried about his health, it's obvious that something is going on. It's not just dumb reports from media.
So as of today, I believe it's a 50-50 chance he leaves. Anything can happen. I don't think Marotta would be able to squeeze 60M from United. 45M looks more likely IMO (even though Vidal is clearly worth more than that).
What would we do with this money I have no idea... not very optimistic about its use though. But the club would be sending the wrong message. I would really like if Marotta was more aggressive and simply approached this situation in a more firm and decided way. It feels like if Vidal is staying, it's good. But if he wants to leave and we get 45M, it's also good. Which is not.
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Also I believe if United actually decide to submit a 45M offer within the next week he's gone. If not, I think he only goes in a last-minute transfer if Vidal ups the offer to something like 55M.