Athletico need to keep Aguero... He's an incredible player for them, and I can't imagine they will challenge as much without him. They'd be hard pushed to replace him, despite the amount they might secure for his sale.
I think it would go through maybe next season due to the fact he won't be able to play in the champions league because of his participation in atletico's qualifying matches
Tribalfootball make everything up on pure speculation.. I wouldn't believe this until I heard something concrete from BBC or Sky Sports.. But personally I don't believe Augero would ever go to United.