Enrique replaced Gerardo Martino at the helm earlier this summer and has overseen the captures of Luis Suarez, Ivan Rakitic, Thomas Vermaelen, Jeremy Mathieu, Marc-Andre ter Stegen and Claudio Bravo in what has been a busy window for the Catalan outfit.
"Luis Enrique has been our most important signing of the season," Bartomeu said in a speech at Barcelona's 35th Supporters Club Congress.
"He was the first signing of this 'promised revolution' we were going to issue this summer.
"We already knew him as a player and also as the reserve-team manager. Luis Enrique provides us with passion, leadership and also hard-working sacrifices."
Barcelona open their La Liga challenge against Elche this weekend.