"Sadly, it is clear, that a full recovery from his vocal injury is not possible"
The Aerosmith frontman made a guest appearance during The Black Crowes' recent London show
The band have also added some new shows to the run
Steven Tyler plays harmonica on Slash's and Johnson's cover of Howlin' Wolf's 'Killing Floor'
The Guns N' Roses guitarist also shared lead single 'Killing Floor' with AC/DC's Brian Johnson and Aerosmith's Steven Tyler
He was accused of sexual abuse last November
Jeanne Bellino claims that Tyler violently assaulted her twice in one day in the summer of 1975
The band had previously pushed back a handful of gigs after Steven Tyler suffered a vocal injury
"It was bad. It was not good," the Papa Roach frontman said
“I’m heartbroken"