Given his age, you can only really expect 3 good seasons from him. The reported deal equates to £60m/yr, which is frankly ridiculous. I'm far more upset that we missed out on Mbappe than Sanchez.
What's funny about this is that we were one of two clubs seriously interested in him in this window. We offered him £290k/wk and yet United are offering £500k/wk. Why such an enormous gap? Either United are really terrible negotiators or the prospect of playing for United needs the mother of all sweeteners.