The Reds secured qualification to the last 16 of the competition on Tuesday, with a 3-0 win at Luton Town, courtesy of goals from Juan Mata, Marcus Rashford and Mason Greenwood.
It was confirmed that we would face the Seagulls at the Amex - in a repeat of this Saturday's Premier League fixture - after Graham Potter's side saw off Preston North End 2-0 at Deepdale, less than a week after dispatching Portsmouth 4-0 in the second round.
And, after the culmination of the remaining third-round ties, we now know that our cup clash against the south-coast club will kick off at 19:45 BST on Wednesday 30 September.