The United manager confirmed earlier this month that the club had made a bid for Barcelona midfielder Cesc Fabregas and while the boss had no major update on that situation, he insists he remains optimistic over possible signings.
"We hope we will do [sign new players], but what we've got is a good squad already. You can't forget about the quality that's already here," he told reporters in Hong Kong on Sunday.
"Undoubtedly we hope to add to it and I'm quite confident we'll do that... certainly before the window shuts."
On Fabregas, Moyes added: "I couldn't tell you if there will be another bid. Obviously we'll take stock and make a decision on what we do next."
More: Today in Hong Kong blog