Koopmeiners was injured just before the break. It remains to be seen what exactly is going on. Like Marten de Roon, the former AZ midfielder was a basic player. Hans Hateboer was absent due to injury. Koopmeiners is part of the Dutch national team’s provisional selection, announced by national coach Ronald Koeman earlier this week.
Leaders Napoli suffered a sparse defeat on Friday to Lazio, who will be AZ’s opponents in the Conference League Round of 16 next Tuesday. Atalanta are sixth in Serie A.