The Scot's troubles in the transfer market were well documented during the summer - with a failed move for Cesc Fabregas the most high profile - as he secured just Marouane Fellaini.
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"The club has always thought about strengthening," Moyes told reporters.
"You do that every transfer window. We will try and make that happen."
United lost 1-0 at home to Everton on Wednesday as they lost further ground on table-toppers Arsenal - the gap now 12 points - and will have to do without the suspended Wayne Rooney for the visit of Newcastle.
Shinji Kagawa is also expected to miss the visit of Alan Pardew's side.
"Shinji has a sickness bug," Moyes added.
"We need to see how he is on Saturday but he wasn't too good after the game [against Everton on Wednesday]."