After years of legal wrangling, the London Legacy Development Corporation finally confirmed last Friday that it had chosen West Ham to become anchor tenants of the London 2012 stadium in Stratford.
The Hammers are expected to move in to the 60,000-seater venue at the start of the 2016-17 season, and the club are determined to use the fact that they are moving to one of the most iconic stadia in Great Britain as a key selling point for any transfer targets.
Co-owner David Sullivan already appears to have upped the stakes in the market with his pursuit of Vitesse Arnhem striker Wilfried Bony, while other targets for next season have also been identified.
Bolton were able to attract the likes of Jay-Jay Okocha, Youri Djorkaeff and Ivan Campo to the Reebok Stadium after they moved there from Burnden Park and the former Trotters defender, now a regular starter with the Hammers, thinks a higher calibre of player will also be tempted to move to West Ham once they see how good their new home is.
"I think it can only mean good things for the club when you move into a stadium like that," O'Brien said.
"You can attract players and supporters from all over the world to play and watch there.
"If the club want to push on and to finish higher the league, then we need a bigger stadium and to fill it to get the revenue into the football club. It's a great step forward.
"It will be unbelievable. Looking at the stadium when the Olympics were on and seeing what the club want to do with it by turning it into a football stadium, it looks unbelievable."