Def Leppard will be down a man this weekend. They’ll be without guitarist Vivian Campbell when they perform in London Sunday ahead of the Oakland Raiders – Miami Dolphins game at Wembley Stadium as he continues his cancer treatments.

He says, “As many of you know, I’ve been scheduled to start a stem cell transplant, and as soon as I got home from tour I began the necessary tests and preparations. I’ll be admitted to hospital soon for all the yucky bits, so in the meantime I’m headed to Target to stock up on cozy pajamas, fresh underwear and a sackful of car-porn… While I can’t say that I’m looking forward to the process ahead, I’m very much looking forward to what I feel will be a most successful outcome. Next year will be very busy for Def Leppard with a new album and a world tour, and frankly, I don’t think they would sound as loud without me, so I have no intention of letting the team down! See you all (with hair!) in 2015.”

Campbell will also sit out the band’s shows in California in late October and early November.