The Magpies have already signed two defenders this summer.
Newcastle United manager Rafael Benitez has admitted, as quoted by the Chronicle, that he is desperately trying to bring in another centre-back and suggested that a new arrival might be around the corner.
The Magpies have already signed five players in this summer's transfer window, spending around £30 million, and two of those new players are defenders.
Right-back Jesus Gamez has been brought in from Atletico Madrid and 21-year-old centre-back Isaac Hayden joined from Arsenal, making his first appearance in the 6-0 win over Irish side Bohemians.
Though Benitez has done some work to shore up his backline, experienced defenders Fabricio Coloccini and Steven Taylor have left St. James' Park since the end of last season.
That leaves Hayden, Chancel Mbemba, Jamaal Lascelles, and Kevin Mbabu as the Magpies four central defenders, with Lascelles the oldest of that quartet at just 22.
Benitez admitted that he and managing director Lee Charnley are working desperately behind the scenes to bring in another player in the position, and suggested that a new arrival could be just around the corner.
The Spaniard said, as quoted by the Chronicle: "I hope so. We are working hard. Lee Charnley knows we need bodies to have all of the positions covered.
"We are short of centre-backs. We had to manage that with the minutes and positions. It is clear that in some positions we need bodies.
"I think we will have somebody soon."
One name heavily linked with Tyneside has been that of Blackburn captain Grant Hanley, but after two bids were rejected by the Lancashire club, Rovers manager Owen Coyle dismissed Benitez's valuation of the 24-year-old.