I've defended him for a while and while I still I think he is a talented player I think his lack of fight and mentality is a massive issue. He looks like a player that might thrive in a well functioning attack but when the going gets tough, which it has been for most of his time here, he's just not show up enough. Good moments here and there are nice but when they don't come often enough you have to show more desire and fight in games.
When you look at Sancho and Antony's stats in the PL, they're pretty similar in terms of goals and assists and we should expect more from both. That said if you were to run a compilation of duels, whether it's in the defensive third, middle of the pitch or in the final third it's night and day. He doesn't have to be like Antony or Gabriel Jesus but he bottles out of tackles, 50/50s, blocks, headers, pretty much any sort of physical encounter. It's not the be all and end all but if you're not producing incredible numbers you can get away with it but when you're not producing the good these are the little things that can at least set the right tone for yourself and the team.
I'd be inclined to make next season make or break for him but if anyone serious comes in the summer for him we should be listening at the very least. There is a player in there, but whether it's one that can perform at the highest level under the biggest spotlight, I have major doubts.