A group of Newcastle supporters' organisations have written an open letter to owner Mike Ashley, urging him to invest in players this month.

Toon are 15th on the Premier League table, and fans are fearful the club will be relegated should Ashley chose not to allocate money for transfers during the current transfer window.

The letter read in part: "Dear Mike Ashley. We are writing to urge you to do what is right for Newcastle United this month and we hope, for a change, you are willing to listen to us and act accordingly.

"This is a critical month for the football club, both in terms of your stated desire to sell and the need to strengthen the squad, as repeatedly requested by the manager Rafa Benitez.

"We are hoping you see the sense in striving to do both, but if you cannot find a suitable buyer, then it is imperative that you still release the funds needed to improve the squad.

"To fail to do so, would seem both reckless and foolish given the damage you know relegation will do. The ongoing takeover cannot be used an excuse not to spend money in the January transfer window.

"If you refuse to spend money this month, the risk of relegation not only increases, it will also mean the manager will not sign the new contract you have offered to him.

"You have repeatedly said that you want Benitez to stay, so do the things needed to make sure that happens. In short, back him and give him what he needs in this window.

"I know we have had a difficult relationship in the past, but at this point, we want to look forward, not backwards. Please do what is right this month."