Yeah double checked and you’re right.1-0 should do it.
1-0 would square head to head, would also level GD. So as it would square head to head, GD in head to head and goals scored head to head it’d go down to goals scored.
Liverpool have more goals than Napoli.
Napoli must score at Anfield. Then even a 2-1 defeat wouldn’t knock them out and would need to be beaten by 2 clean goals.