Newcastle boss Eddie Howe concedes there may not be funds for the January market.
Newcastle have struggled with injuries over the first-half of the season.
But Howe admits: "January is always a difficult month.
"We haven't had those assurances [about funds]. I apologise if I sound like I'm saying the same things, but it is a very difficult month to bring in quality players.
"Financial Fair Play continues to play a part in our decision-making, so let's wait and see."
Of his own position, Howe added: "I'm always in the spotlight and criticism is part of this job. It goes hand in hand with it.
"It just goes with the territory. I've learned to accept and understand that and - no disrespect - but to blank it out and make sure I help the players. That hasn't changed for me."