Robin Gibb will perform at an armed forces charity concert despite his on-going cancer treatment.

The musician is battling the disease in his liver and sleeps up to 14 hours a day as a side effect of the chemotherapy he is having.

The Bee Gees star is planning to sing three songs at the charitable Coming Home concert on February 13, including I've Gotta Get a Message to You.

He also wants to perform classics How Deep Is Your Love and Words.

"I'm looking forward to appearing if possible and being able to continue my support for our service men and women. We owe a debt of gratitude to the dedication and professionalism of our armed forces," he told British newspaper The Mirror.

Robin is hoping to raise 50,000 for the charity, which cares for wounded soldiers in the UK.

Despite having been given permission by doctors to perform, friends say it's a "miracle" he will take to the stage.

He is currently being cared for around the clock to get him as fit as possible for the show.

"Quite simply, it is a miracle Robin is able to perform. He is still incredibly weak and sleeping up to 14 hours a day," a source said. "Robin will be literally dragging himself out of bed to do this gig. He is passionate about the charity and wants to do his bit. Our soldiers are modern day heroes but as far as they are concerned, Robin's efforts against the odds are every bit as heroic. It'll be an incredibly emotional evening."