He is getting the chances and still showing very little. For a guy with so much technique and pace he should be doing far more, especially in games like today.
The intelligence he shows on the pitch is worrying. He makes very little effort to move into space, despite being the fastest player on the pitch he can't seem to sprint for 10 yards without the ball to get away from the defender. When he does get the ball more often than not he does a little trick that ends up going nowhere and slowing down the move, allowing the defense to get back in position.
When defending, he neither presses or sits back and ends up getting caught in no-man's land. You can see Higuain asking him to press but he is standing next to Alex Sandro.
He has all the ability to be a success. I'd like to see him just keep it simple and get the ball, go outside the RB and cross the ball in. He hardly ever does that, but it is dangerous when he does.
Cuadrado improved a lot tactically with us, Costa needs to do the same.