I've said it before, but he's been unlucky as fuck that his first season has involved such a mess of a defence behind him + lethargic midfield counterparts in David/Gundo. It's difficult enough as it is to adapt to a new league and find your feet in a Pep team after playing for Simeone. Next season with a more stable backline and Bernardo/Foden playing next to him more often he will improve sinificantly.