Cengiz Under opened his account for Leicester in spectacular style to ensure Brendan Rodgers' men finished top of their Europa League group.
The winger, on a year's loan from Roma, scored a brilliant volley to give the Foxes a 12th-minute lead over AEK Athens, which Harvey Barnes doubled two minutes later.
This win means Leicester will be seeded in Monday's last-32 draw, giving them a better chance of a favourable tie when the competition resumes on February 18.