Armstrong made the controversial comments in a recent Kerrang interview, in which he called Bon Jovi the worst band that Green Day had ever shared a stage with.
© Rex Features / Willi Schneider
© PA Images / PA Wire
Sambora reacted to Armstrong's condemnation of Bon Jovi while speaking to Rolling Stone over the weekend.
"I have no idea what happened with that, I actually don't recall them opening for us," the guitarist admitted.
He continued: "Either I was incapacitated at that point or I just don't remember it. I'm sorry he had such a bad time."
© PA Images / Anthony Harvey/PA Wire
Armstrong announced that he would check into rehab for substance abuse on Sunday (September 23), just one day after a stage outburst at the iHeartRadio Music Festival.
The 'Oh Love' singer's rehab stint will not conflict with his role as a mentor on The Voice as he pre-taped all his appearances earlier this month.
Green Day's latest album ¡Uno! is now available, with ¡Dos! and ¡Tré! being released in the coming months.
Watch Billie Joe Armstrong's IHeartRadio Music Festival meltdown below:
