When rock giants Kings of Leon abruptly cancelled their tour yesterday millions of fans were left devastated.

But problems within the four-piece’s camp run far deeper than their management is letting on according to an American magazine.

Although the band said that lead singer Caleb Followill was ‘suffering from vocal issues and exhaustion,’ an insider close to the Grammy winners told the magazine he has an alcohol problem.

No more for the road? It has been claimed today Kings of Leon star Caleb Followill's bandmates want him to check into rehab before they tour again

The source told US Weekly: ‘They are trying to get Caleb to go to rehab. It is mostly for alcohol.

‘[That's why] they ended up cancelling the whole tour. He drinks like a fish.’

If the revelations are true it would make the singer’s rant on Friday night when he stormed off stage in Dallas, Texas, claiming it was 'too hot' even more shocking

Charmer: Lucky Caleb recently married to Victoria's Secret model Lily Aldridge

He said: ‘I'm gonna go backstage and I'm gonna vomit, I'm gonna drink a beer,’ before walking off for the night.

Another source close to the group said Caleb, who recently married Victoria's Secret model Lily Aldridge, has been battling a problem for a long time.

He said: ‘It's true. Caleb's drinking is out of control and they are trying to get him into rehab. 

‘It's a dark demon he has been fighting for awhile.’

However a representative of the band has denied the accusations,  and reaffirmed claims the singer just needed some rest.

He said: "The reason for the cancellation of the tour is Caleb is under doctor's orders for vocal rest. 

‘They feel terrible about cancelling. They look forward to getting back on the road at the end of September.’

However Caleb's bandmate and brother Jared has hinted the problems are bigger than is being officially let on through Twitter.

On Saturday he wrote: ‘There are internal sicknesses and problems that have needed to be addressed.

‘I know you guys aren't stupid. I can't lie. There are problems in our band bigger than not drinking enough Gatorade.’

On Monday, when the tour was cancelled, he added: "Utterly depressed. It's completely out of my hands. Family has to come first.’

Band of brothers: Caleb's family filled band are concerned for the singers well-being and are urging him to seek help according to claims

A third source all the members of the Nashville, Tennessee band, which also features two of Caleb's brothers and a cousin, love to party hard.

He said: ‘They all drink, all the [bandmates]. Anyone in a band usually likes to have a few beers on the road.

‘They have never discussed [Caleb's drinking] as a problem before.’