The Hammers are currently lingering one point above the drop zone and it is believed a boost to their midfield stocks is a priority.
But whoever arrives at the club, Moyes is adamant it must be next month.
"I'm giving players chances; I'm in a hurry, and I have to be in a hurry," said Moyes. "Because of that I can't wait three or four months to see how you play.
"Everyone's shown a great desire and is committed in training, but we're short in some areas, and overloaded in some other areas."