Under doctor's orders not to move for several months following a five-hour surgery to repair multiple injuries, the singer hopes to heal in time for the May launch of U2's 2015 world tour in Vancouver, a trek that will see the band play six UK shows in October.

Bono has not been able to physically move around much lately, and is realizing that he may have some long-term limitations as a result of his injuries.

He says: "Recovery has been more difficult than I thought... As I write this, it is not clear that I will ever play guitar again. The band have reminded me that neither they nor Western civilization are depending on this."