The Hammers have made four new signings so far this summer.
West Ham manager Slaven Bilic during the press conference
The Hammers were looking to build this summer after an impressive first season under Slaven Bilic, in which they finished seventh and secured Europa League football.
They have added four new faces so far, with midfielders Havard Nordtveit, Sofiane Feghouli and Gokhan Tore, and young striker Ashley Fletcher all making the move to the Olympic stadium.
Borussia Moenchengladbach's Havard Nordtveit reacts
They have been frustrated with their efforts elsewhere though, especially in the hunt for a new first-choice striker with moves for the likes of Michy Batshuayi and Alexandre Lacazette having failed.
And former manager Curbishley has said that they must up their game as this summer has been a little slower than they would have hoped for.
“The great success West Ham had last season was down to their recruitment last summer,” he told Sky Sports.
“I think this summer it’s been a little bit slow. They do really need to up their game in the recruitment side of it. [David] Gold and [David] Sullivan will know they need to deliver some players.”
West Ham's Sofiane Feghouli in action
It remains to be seen whether West Ham can make any more signings in the rest of the transfer window.
It is well known they need a striker but they are not the only club still looking to add in that department this summer.
Indeed competition is fierce, and unless they are willing to pay over the odds, they may be frustrated in their hunt.
West Ham manager Slaven Bilic