Moyes has taken charge of three West Ham matches since taking over from Slaven Bilic, but he has been unable to inspire the London side.
Moyes has failed to pick up a victory yet, with West Ham beaten 4-0 by Everton in their most recent outing.
Moyes is yet to name an unchanged line-up since taking over as West Ham boss.
And Curbishley believes that Moyes doesn’t yet know his strongest team.
He said: “The recruitment in the summer - they brought a lot of players in - but because of injuries and a lack of form they don’t know their best first XI.
“I think once David sorts that out and gets them organised then they’ll pick up.”
West Ham’s problem comes from the fact that their fixture list is not doing them any favours.
With the Hammers desperate for a win, Moyes’ side have a hugely tough run coming up.
West Ham are due to take on Manchester City, Chelsea and Arsenal in their next three matches - and a big improvement will be required if they are to pick up any points.