JOHN CARVER has labelled this summer as the most important in Newcastle United’s recent history – and has called on the club’s hierarchy to spend money on overhauling their ailing squad.

Head coach Carver has seen his playing resources ravaged by injury this term, and with several players out of contract in the summer and key areas of the pitch desperately needing attention, Carver has revealed that the club will be investing in the close season.

“This is the biggest summer in the club’s recent history, definitely. Definitely. We know that, everybody knows that,” said Carver.

“Let me tell you, Lee Charnley, Mike (Ashley), they all know that. We have to get it right, yeah.

"Going back to the investment and I have said it last week and straight from the heart, they know, the football club know that they have to invest in the team because you can only keep going for so long. They have to invest in the team. And I have had assurances they are going to.”

Carver’s calls come at a time when the Magpies are in rude financial health, having reported record profits in the last financial year and announcing they have placed more than £38million in a bank account. And, if they retain their Premier League status, their coffers will be bolstered by a share of the £5bn TV deal struck between Sky Sports, BT Sports and the Premier League this year.

Full accounts registered with Companies House on Monday show that £38.6m was transferred into Newcastle's bank account as a cash-flow sum - paying off a £4.5million overdraft and leaving £34.1m available.

The accounts say owner Ashley still has £129m in interest-free loans outstanding but the money in the bank means the club's net debt is down to £94.8mn.

However, while the picture is rosy on a financial footing, Newcastle’s season on the pitch has threatened to unravel completely, with a 2-0 defeat at Liverpool following their fifth derby defeat in a row to Sunderland.

They are not completely safe from relegation and, while they are quietly confident that they will not drop into the bottom three, Carver is keen to make it mathematically impossible for the Magpies to be relegated.

The current malaise on Tyneside has led to renewed calls for a boycott, with fans threatening to stay away from St James’ Park for the Magpies’ home game against Tottenham on Saturday.

And with Carver yet to be given any assurances on his long-term job security at Newcastle, there are more questions than answers in Newcastle at present.

Carver said: “There are certainly as lot of decisions to be made, aren't there, especially where we are and the situation we are in?”

“But that's out of my hands. I can't do anything about the protests, I can’t do anything about what's going to happen next season with my position, so I have just got to stay focussed and maintain some sort of level-headedness going into these games and make sure we get the right results."

"Get some points next six games, that's a priority. They need to invest in the summer. They've said they're going to invest in the summer. Whether they've said it in previous summers and it hasn't happened I don't know.

“What I'm saying is they've said it to me and I'm adamant that they're going to invest. I've seen the plans and that is encouraging. That is encouraging - not for me as John Carver the head coach but for John Carver the fan inside me. I can't say more than that - that's how it is.”

Carver feels that with the right investment, the Magpies could emulate Southampton’s success this season. The Saints had a high turnover of players in the summer, as well as losing their manager to Tottenham, but under Ronald Koeman have been ensconced safely in the top ten for the duration of the campaign.

Newcastle will have turnover of their own – Sammy Ameobi, Jonas Gutierrez and Ryan Taylor are all out of contract in the summer, with Steven Taylor, Fabricio Coloccini, Mike Williamson alongside others out of contract the following year.

But Carver said: “If we invest right why can't we go after European spots, Champions League spots why not? Look at Southampton, they lost so many players and had to replace them. They've done a great job this year. Every so often a team just comes through from somewhere - like we did (in 2012).

“You have seen all the investment and it does not necessarily buy success. I will use Man City as an example.

“Alright, they have won it but they ain't going to win it this year and they have spent millions. So you know, you have to do it the right way and invest our money in the right manner but it does not guarantee success.”

Meanwhile, Newcastle’s accounts also reveal that £29.8million was spent on signings after June 30, with £12.6million coming in player sales - mainly from Mathieu Debuchy's move to Arsenal.

The reported income from player sales does not appear to cover the January departures of Mapou Yanga-Mbiwa and Davide Santon, whose sales brought in around a further £8million.

Newcastle's salary bill rose to £78.3million from £61.7million, a 27 per cent increase, but that was more than covered by the increase in income from the new Premier League television deal and sponsorship income - the ratio of wages to turnover dropped from 64 per cent to 60 per cent.