It had initially been announced earlier this month that Guardiola would pen his new deal on Tuesday, but that has now been moved back 24 hours.
Barca said on their website: "For reasons of agenda, the signing of Josep Guardiola's contract renewal, scheduled for this Tuesday, February 22, will finally take place on Wednesday, February 23, after first-team training, around 1300, in the club offices.
"The coach of Barcelona will sign for one more season, until June 30, 2012, as announced on February 8."
Guardiola, 40, took charge of the Catalan giants in 2008 and has already led the club to eight titles.
Barca are currently five points clear at the top of the Primera Division standings, through to the final of the Copa del Rey and in the last-16 of the Champions League, where they trail 2-1 to Arsenal after the away leg.
