West Ham United manager Slaven Bilic
The club's big move to the Olympic Stadium was meant to push the Hammers on to the next level after they finished just four points off the Champions League places in their farewell campaign at the Boleyn Ground.
None of that materialised, though, and instead Bilic's squad was diluted with a glut of poor quality loan and free transfer signings.
The two Davids have since pledged to get things right this summer and Bilic has publicly stated he is targeting quality over quantity with eyes on four "game-changer" signings.
Pablo Zabaleta has joined on a free but Parlour has called the club's owners out on talkSPORT and insists they must start spending money.
"I think it's a big season for West Ham again," Parlour told talkSPORT.
"They under performed a little bit last year, but I'm really pleased they stuck with Slaven.
West Ham co owners David Sullivan and David Gold
"But now they've (Sullivan and Gold) got to invest... (the likes of) Chris Smalling and Joe Hart have been mentioned with going there and they do need investment West Ham this year to really push on to be in that top 10."
The club's ability to finally compete with the Premier League elite in the transfer market was dangled as a carrot to supporters who were unsure about leaving their beloved Upton Park.
But clubs like Everton are showing what serious investment is already this summer with some big signings and more to follow.
Boyhood Hammer Ray Parlour
Finishing below clubs like Bournemouth with a fraction of West Ham's income will not be acceptable to supporters next season.
And given the club has been named in the top 20 wealthiest in Europe, it is time they started acting like it by spending what is required to attract top quality additions.