The attendance was recorded at 45,968, with several blocks of seating filled by only a handful of supporters for a game coach Ronald Koeman said the team had to win to have any chance of reaching the last 16.
After losing both of their opening games in Group E 3-0 to Bayern Munich and Benfica, Barcelona needed victory to resuscitate their chances of progress and avoid the embarrassment of going out in the group stage for the first time since 2000.
Pique at least ensured the job was done in that regard, his close-range finish towards the end of a dreary first half enough to get Barca up and running, with a crucial game away in Kiev now to come in two weeks' time.
Before then, they face Real Madrid in the first 'El Clasico' of the season on Sunday, when another win would make it a hugely positive week for Koeman, whose future looked bleak when the team lost to Atletico Madrid before the international break.
That game will also be at Camp Nou and it remains to be seen if the number of Barcelona fans in attendance improves.
