O'Neill said: "I am in the process of acquiring some more players.
"I have allowed some players to go and the owner-chairman has allowed me to run the football club in the fashion I am doing and I will be getting reinforcements in.
"I would prefer to wait a bit longer for the choices I made but between now and transfer deadline day, we will have them in. I am absolutely sure.
O'Neill added: "How many will be coming in? It is hard to say but by the end of the transfer window I would not want to be out-numbered in the sense of how many have gone out of the club and who has come in so we have a few to bring in.
"The fans will think we are losing some players and the reinforcements have not come at this moment but they will be there."
Despite his confidence in acquiring new talent, O'Neill made it clear he will not pay silly money for players.
He said: "Sometimes prices dictate a few things. I don't mind paying slightly over the odds for someone in a market where that is what people are doing.
"But sometimes when it is an enormous amount, I'll have to maybe reconsider. It is trying to get in the players I want and it's also trying to get value for money. If the two equate, then great."