Manchester United said on Thursday they were "in danger of breaching the Premier League's Profit and Sustainability Rules (PSR)".

The club acknowledged this in a letter sent to supporters groups in response to concerns over rising ticket prices. United have suffered pre-tax losses of £312.9m over the past three years and are currently in a precarious financial position, preventing manager Ruben Amorim from making any signings in the January transfer window.

"We have suffered significant losses totaling over £300 million in each of the past three years," the letter sent by the club said. "This is unsustainable and if we don't take action now we face a failure to comply with the PSR for years to come/ FFP (Financial Fair Play) requirements are in danger and severely impact our ability to compete on the pitch.

"We will get back to a cash position as quickly as possible, but we are going to have to make some tough choices to get there."

Premier League clubs who breach PSR rules, which allow clubs to lose up to £105 million ($132.5 million) over three years, could be subject to fines and points deductions. New owner Sir Jim Ratcliffe has implemented extensive cost-cutting measures since taking over in February, including making 250 club staff redundant over the summer.

Sources have told ESPN that United's financial constraints mean they are willing to entertain offers for any senior player in January. Among them is academy graduate Alejandro Garnacho.

Although the club does not want the youngster to leave, they may be forced to negotiate with Chelsea or Napoli before the deadline.

United have also faced backlash from fans over rising ticket prices, with fans launching a fierce attack after the club raised the minimum ticket price to 66 pounds ($81) mid-season. Previously, the lowest ticket price was £40 ($49).

The club said it "does not expect fans to cover all current shortfalls" but will consider its ticket pricing strategy to ensure "appropriate amounts are charged".

United sacked head coach Erik ten Hag in late October, just months after signing a new contract extension with the Dutchman for next season. Then, in December, the club announced that sporting director Dan Ashworth would leave by mutual consent, less than six months after taking over as part of Ratcliffe's overhaul Leave this position within.

United's financial problems come at a time when the stadium needs improvements.

Last week, head coach Ruben Amorim said it was "perhaps the worst game in United's history" after the defeat to Brighton left United 13th in the table and one step away from qualifying for the Champions League. Close to the relegation zone.

This report used information from The Associated Press.