There is some concern he might jump ship quickly from United considering was talking to West Ham not long ago. We don't know if he just wants to take a step into the PL or sees doubling or trebling his salary the biggest thing, it can be both and that is understandable, perhaps riches is a huge driver for him, we don't know.
Madrid might be a better example rather the cheaty but who knows, with his ex Sporting CP DOF at cheaty, perhaps he can convince Amorim to join in 2/3 years if still a top prospect, derail United's progress while getting his target. You've go to wonder what comes your way with state ownership, what doors for you and your wider family can open to their business or interests, free unlimited flights and much more. Amorim could be tempted with the advantage a state club has with the resources and unlimited squad for an easier win path.
Sporting dealt a huge blow to Braga mid season, Amorim is talking to West Ham, I'm not going to shed a tear but still respect what Sporting are as a top club in Portugal, seems it's big bad Manchester United again and everything is highlighted and put through inspection, we now need a sob story instead on the normal function that happens at every level every day and could happen to United.