I watched the game and was very impressed with his performance. What I liked was that he has very good decision making - he would very often choose the right option, even if sometimes that option didn’t come off. With Valencia, there are many times where he SHOULD take on the left back and be in a good crossing position but he will check back and pass it to someone who crosses from a much deeper position. This has a hugely negative effect on our play - it means all of our attackers are trying to score a header from a non moving position so there’s no momentum.
I also liked his defensive play and he is good positionally at the back post when a cross comes in from the opposite side, again something Valencia is not great at (not knocking him, he’s not a right back after all).
He’s tall, he’s fast, he’s has good technique and is comfortable on the ball, he’s 19, speaks English and he’s a Utd player. Don’t know what’s not to like.