Pompey exited the Carabao Cup following a defeat to Premier League side Brighton.
Kenny Jackett's side were beaten 4-0 at the Amex Stadium, but only trailed to Alexis Mac Allister's header at the break.
The Seagulls netted three times in quick succession after it, though, with Alireza Jahanbakhsh, Bernardo and Viktor Gyokeres all finding the target.