Scott Sinclair and Tom Rogic led the way once again as Celtic saw off Linfield 4-0 at Celtic Park.
As in the first leg, the Bhoys dominated possession but this time turned it into more goals, sealing a 6-0 victory on aggregate.
Sinclair opened the scoring on four minutes and netted the third goal as well, both profiting from kind deflections off a Linfield defender.
Tom Rogic made up for a glaring miss at the end of the first half with a long range effort on 47 and he then teed up an injury-time goal for substitute Stuart Armstrong.
For Linfield, defender Mark Stafford impressed with another stout display and could even have found the net with a late overhead kick that flew agonisingly off target.
The Glasgow side carried a 2-0 lead over from the first leg thanks to goals from Sinclair and the outstanding Tom Rogic.
Celtic will now face Rosenborg in the next round after the Norwegians edged out Dundalk 3-2 on aggregate after extra-time.