Barcelona striker Lionel Messi breaks through the Celtic defence.
Barca, who won the first leg 3-2 at Parkhead, had a host of opportunities to extend their lead but Celtic goalkeeper Artur Boruc pulled off a string of fine saves.
The shine was taken off the first knockout round triumph, however, when livewire Argentina forward Messi hobbled off 10 minutes before the break with what seemed to be a thigh injury.
English football awaits new dawn