Bournemouth have lost three games in the Premier League against Chelsea, Crystal Palace and Manchester United.
The Cherries have slipped to 16th and just a point above the relegation zone ahead of Saturday’s visit to in-form Brentford and new chairman Bill Foley is expected to spend on strengthening the squad this month.
“Hopefully at the end of the window we’ll have some additions that add to what we’ve already got,” manager O’Neil said.
“Most of the conversations have been with the recruitment team and Neill (Blake, chief executive) and Richard (Hughes, technical director).
“But everyone is working hard trying to do some things that will help the club in the short and long term.
“The next few weeks and months are going to be big, we know that. As always, the focus is 100% on this Saturday away to Brentford.”
Bournemouth and Brentford shared a goalless draw at the Vitality Stadium in October, their first top-flight meeting.
Just one point separated them at the time, but Brentford have moved up to ninth with the Bees taking 10 points from the last 12 on offer.
O’Neil said: “They have a real, clear style. No wonder some of their best results have come against real, top teams.
“They are a threat from set-pieces, counter-attacks and so is Ivan Toney.”
O’Neil is without the suspended Adam Smith after the full-back picked up five bookings, and says he will have to make “a couple of late calls” due to a long injury list.
Neto, David Brooks and Marcus Tavernier have suffered hamstring injuries, while Ryan Fredericks and Junior Stanislas are struggling with knocks.
Midfielder Jefferson Lerma missed the Burnley defeat with a knee problem.
American businessman Foley and the Black Knight Football Club, meanwhile, have acquired a significant minority stake in French Ligue 1 club Lorient.
Foley, who took charge of the Cherries last month, said: “We are delighted to announce a strategic partnership and investment in FC Lorient.
“Loic Fery has successfully built a best-in-class football club and will be a great partner as we build BKFE into a leading multi-club football operator.
“I look forward to partnering with Loic and his team to accelerate the success of FC Lorient and BKFE.”
Source: Bournemouth boss Gary O’Neil hoping to ‘have a few additions’ to his squad this month
