Geezer Butler is having nightmares and "palpitations" ahead of Black Sabbath's reunion gig

He told the Guardian newspaper: "I'm already having palpitations. In fact, I had a nightmare last night.

"I dreamed everything went wrong on stage and we all turned to dust. It's important that we leave a great impression, since it's the final time that people will experience us live. So it has to be great on the night."

The 'Back To The Beginning' show at Villa Park on 5 July marks the first time frontman Ozzy Osbourne has reunited with his bandmates Geezer Butler, Tony Iommi and Bill Ward in 20 years.

Ozzy has struggled with health issues including Parkinson's disease over the last few years, but he is planning to play a short solo set before joining the rest of the group for a Sabbath spectacular.

The singer has admitted he won't be putting on an energetic show and will likely spend most of the gig sitting down, but he's trying his best to be as fit as possible for the big day.

He told the Guardian: "I do weights, bike riding, I've got a guy living at my house who's working with me. It's tough - I've been laid up for such a long time. I've been lying on my back doing nothing and the first thing to go is your strength.

'It's like starting all over again. I've got a vocal coach coming round four days a week to keep my voice going."

Ozzy's wife Sharon previously insisted the singer's voice is as good as ever despite all of his health problems.

She told The Sun newspaper: "He's very happy to be coming back and very emotional about this [planned gig].

"Parkinson's is a progressive disease. It's not something you can stabilise. It affects different parts of the body and it's affected his legs. But his voice is as good as it's ever been."