The club proposed a £495 million expansion of their stadium in December which would take the capacity of the ground up to 105,000
The Blaugrana unveiled a proposal to expand the capacity of their famous ground to 105,000 seats back in December.
The initial plans were rejected by a local university who objected to a new stadium being built on their land. As a result any new structure will now be erected on the exisiting site rather than on a new plot.
Barca host Real Betis on Saturday evening and members have been invited to register their vote in a poll outside the ground during the day, which runs between the 12 hours from 9:00 to 21:00 CET.
More than 50% of the club's 'socios' are expected to vote as the club looks to the build for the future on the back of a week which saw the Catalans banned from signing players for at least the next two transfer windows.
If approved, building work is scheduled to begin in 2017 and conclude by 2021.