diff --git a/app/views/cards/display/common/_assignees.html.erb b/app/views/cards/display/common/_assignees.html.erb
index d4455dcbe..489721726 100644
--- a/app/views/cards/display/common/_assignees.html.erb
+++ b/app/views/cards/display/common/_assignees.html.erb
@@ -1,5 +1,5 @@
 <div id="<%= dom_id(card, :assignees) %>" class="position-relative" data-controller="dialog" data-action="keydown.esc->dialog#close click@document->dialog#closeOnClickOutside" <%= "hidden" if card.closed? %>>
-  <button class="card__assignees-trigger" data-action="click->dialog#open:stop keydown.a@document->hotkey#click" data-controller="tooltip hotkey">
+  <button class="card__assignees-trigger" data-action="click->dialog#open:stop keydown.a@document->hotkey#click" data-controller="tooltip hotkey" tabindex=<%= (local_assigns.key?(:preview) && local_assigns[:preview]) ? -1 : 0 %>>
     <% card.assignees.each do |assignee| %>
       <%= avatar_preview_tag assignee, tabindex: (local_assigns.key?(:preview) && local_assigns[:preview]) ? -1 : 0 %>
     <% end %>