James Arthur is still traumatised by his attack

Speaking after Revell was jailed for the attack, Christopher told The Sun: "It was an ordeal. It was tough to see footage of it.

"It was quite disturbing to see it. I’m glad it’s behind me.

"I will feel nervous about going home and seeing friends and family. I don’t know what kind of damage it’s done.

"The worst thing about the physical damage is that I worry about head trauma — even when I’m playing football, something like heading the ball. I worry about it. Even moshing on stage."

The attack came after the 'X Factor' winner, 28, had a one-night stand with Revell's ex-girlfriend Gemma Iveson and James insisted it was not her fault.

He explained they were no longer in touch but added: "I think she’s been very kind in the media. She’s expressed concern and she seems sorry. She doesn’t have to be sorry — it is what it is."

Earlier this month Revell pled guilty to wounding with intent at Teeside Crown Court, and was sentenced to five-and-a-half years in jail.

Revell - who had 12 previous convictions including battery and assault - was told by Judge Tony Briggs that his attack was "aggravated" and "serious", and therefore jail time was "inevitable".

Prosecutor Nick Dry told the court: "James Arthur and his group were walking towards the beer garden when without warning or provocation Mr Revell smashed a glass forcibly on the back of his head.

"As he stumbled forward from the incident the defendant followed up with a punch. He claimed he had attacked [Mr Arthur] because he had slept with an ex-girlfriend some time ago. He said he had lost it and whacked him as hard as he could. He denied using a glass and said he had gone into a rage when Arthur smirked at him."

The 'Impossible' singer said he was left feeling "nervous and uneasy" after the attack, and was initially unsure how his injury would affect his music career.

In a statement read out in court, James said: "Through no fault of my own and as a result of a totally unprovoked attack I am left feeling nervous and uneasy about visiting my family in my home town.

"There was nothing to justify the attack. I was worried I had suffered an injury which might affect my musical career."