Mike Ashley has drafted in Justin Barnes, one of his most powerful and abrasive lieutenants, to help run Newcastle United as he looks to attract outside investment.

Barnes is a long-term associate of Ashley and the lawyer has been described as the sport shop billionaire’s “fixer” and “most reliable deal maker”. His appearance at St James’ Park has ruffled feathers as he looks to establish his influence over the decision-making.

The Daily Telegraph understands that Barnes has taken a keen interest in the business over the past few months and managing director Lee Charnley has been forced to run most large financial decisions past him before he has been allowed to act by Ashley.

Barnes has helped Ashley make a series of acquisitions for Sports Direct and is part of his notoriously publicity-shy inner circle, but has never worked in football before.

Although Barnes is not employed by the club, he now has a huge say in how things are done and has also been given the task of trying to persuade potential investors to buy a stake in the club.