Sunderland could be set to have a busy January transfer window after losing their last three matches.
Soon after taking charge Allardyce told the Daily Mail that he was expecting to have a quiet transfer window in the new year.
However, after three consecutive defeats the 61-year-old manager’s opinion appears to have altered, and he has suggested that unless some improvements are seen quickly additions will have to be made.
"The players in the dressing room know that and they have to do better," Allardyce said.
"I have to find a solution, if I can't find a solution in the squad I have to find a solution in January and see where we go from there."
According to the Daily Mail, Sunderland have around £20million to spend in January as they look to bolster their squad.
Queens Park Rangers striker Charlie Austin is said to be high up on their wishlist, but there are doubts over whether the front-man will leave Loftus Road this season.
Sunderland are also looking at securing the addition of a centre-back as Allardyce wants to tighten up his side’s back-line.
West Ham United player James Collins has been linked in the Sunderland Echo, while the Wearsiders are also said to be keen on Schalke defender Joel Matip.