The band has been left without a vocalist after Harnell quit this week (beg28Dec15) less than a year after he took over the job from frontman of 15 years Johnny Solinger, who exited in April (15).
Harnell's departure has sparked rumours the band may return with original member Bach resuming vocal duties, but the rockers have now released a statement vowing to continue without their former frontman.
"As you may know, Tony Harnell quit the band yesterday. We found out about his decision the same way all of you did, via his post on social media..." the band's statement reads. "The last we spoke with Tony was on December 17. He was in the hospital being treated for 'bronchitis with asthmatic symptoms.' We were all very concerned and offered any assistance we could to help him get healthy. Due to his condition, we were forced to cancel our show in Chicago on December 19. The next time we heard anything was his post yesterday.
"That being said, we are all moving forward and wish Tony the best in his future endeavors."
The musicians go on to insist they will not be reuniting with Bach or performing with Guns N' Roses, who are rumoured to be reforming the band's original line-up next year (16).
"Amidst all of the rumors and speculation, there has been no talk of a reunion (with Bach) nor are we opening for Guns N' Roses," they add. "That's it for now. We'll keep you updated as best we can. Thanks for your support and understanding. See you in 2016!"