Lee Johnson will meet up with Kristjaan Speakman next week to discuss the January transfer window and hopes he can work around the EFL's £2.5m salary cap.
"It's difficult, but I do believe we have got some headroom," he said. "I'm actually due to sit down with Jim [Rodwell, Sunderland' chief executive], Kristjaan, and everybody next week to get a bit more of an understanding about where we are with that. But there are a number of ways you can do it - you can create it by moving players in and out, and you can nurture it by bringing young players up and as I said the other day Jack Diamond did well on Tuesday [at Oldham], for example. There are also a lot of things that don't need a lot of money. It's not a case of saying 'I need X-millions of pounds to bring in players', sometimes it might be for example technology. I might be able to develop one individual much better if we spend, say, £500 on this piece of technology. There are loads of things like that. I've come from a club where I was allowed to drive that technological side of things, and be one of the biggest innovators in the country in terms of data and pitch side screens, and being able to fast-track data and information to the players. We were the first to put drones up in training, too, and those are the kinds of things I'm talking about. It's not just about throwing money at players to get short-term wins, it's about investing in the future of all the people at the club rather than just new signings."