I don't know how they could know that, since the deal hasn't been officially accepted yet. How could they possibly know what we'd be offering?
Either way, it looks like this deal is actually on! A few big names have reported it. Also, allegedly, there's no substance to the Newcastle rumours, so we're currently the only team in the running.
£20k a week is excessive, and we shouldn't be paying that much in wages when transfer fees have already exploded in this division. £10k a week sounds reasonable to me, since I imagine a lot of our players' wages have substantially increased after promotion. He'll be at the higher end, but to be fair Lingard did just score against Barcelona. The money is probably justified.