If Sancho doesn't come, we should go for Adama Traore. At 24, he is just coming into his peak now. I don't think he would be ineffective against deep defences, because as we have seen, he can easily beat a man and is lightning quick off a stand still. His cross for Jimenez' goal v West Ham is an example of what he could bring to us.
Under Nuno's guidance, he looks to be putting his game together very well. He can be one of the best in the future if he carries on this trajectory.
Lack of goal threat is perhaps something of a concern, though. He's a fantastic dribbler and every leftback in the league must hate playing against him, but I'm not sure that the end product is quite there.