In June, Mustaine said that the bass guitar recordings Ellefson made would not be on the new album. A different bassist was going to make new recordings. Mustaine did not say who this bassist was. When the band went on tour before the album came out, James LoMenzo played with them. LoMenzo was a bass guitar player for the band. Mustaine later said that Steve Di Giorgio, the bassist for Testament, played the bass on "The Sick, the Dying... and the Dead!". On May 31, 2022, Megadeth said that LoMenzo was rejoining the band.