The band issued a statement today and say a new date will be announced so anyone with tickets should hold onto them for the rescheduled date.
The statement read "Everything was going so well coming up to our 3Arena show and Christy was doing great. However, he has suffered a set-back with his treatment and we have now been instructed by his doctors that it is not advisable for Christy to perform this Saturday. Christy, Joe, Alan and Billy are beyond devastated to have to share this news with you. We are working to find a new date at 3Arena so do hold onto your tickets as they will be fully valid for the rescheduled date. As you all know, Christy's health is priority and we also have to respect his privacy at these times.
Stay with us X
Aslan".