So far this summer, the Premier League champions have signed 20-year-old full-back Guillermo Varela from Atletico Penarol and have fended off two bids from Chelsea for Wayne Rooney.
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"There is a need to do it but there's no pressure to do it. We'll bring in one or two if we can," Moyes told reporters.
"It's something I'd like to do and we've been talking about it probably since I took the job on 1 July. But we won't do it because people like you tell us we should be signing players."
Moyes concedes United may not sign any more players this summer and is adamant that he will not panic buy.
"I have an idea of where I need to strengthen and, if the right players are available, then great. If not, the first thing we'll do is encourage our own young players in the squad to do as well as they did last year.
"There is a possibility [we won't sign anybody] but the plan is we bring in one or two if we can. I think there's value [out there] but we have only targeted certain players and don't have a big, big list. There are only certain quality players we want to bring to the club."