I think we can be sure that there's, still, not an agreement between Juve and ManU, even when everyone's reporting it, and there have been turds all around the internet saying that it will be official in between 24-48 hours.
If there was, Pogba would already be training with United, I'm almost sure. Contrary to us, Martial is already with them, we're expecting Pogba and Evra to start training on August 7. So, just going by that logic I'd asume that Mou would want him to be already training with them if there was already a deal for the player, instead of living the American dream.
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So, if Pogba is in Vinovo by August 7th, I'll positive about the possibility of him staying.