According to Ultimate Classic Rock, Joe Zocco filled in for Viv Campbell during Def Leppard's performance in Leon, Mexico on Saturday, Jan. 18 as he recovers from cancer treatment.

Def Leppard rocked the stage during their first performance of 2025 at Feria Estatal De León in Leon, Mexico. But while fans enjoyed the show, they quickly noticed that one bandmate was missing: longtime guitarist Viv Campbell.

Vivian Campbell has missed both shows Def Leppard have played since the finish of last year's Summer Stadium Tour

Def Leppard played their first show of 2025 on Saturday night in Leon, Mexico, but one of the band’s members was noticeably absent from the group. “Vivian Campbell cannot be with us tonight,” frontman Joe Elliott explained to the crowd in attendance.