Footage of the pair jamming in the studio emerged on Campell’s Instagram page, with Fehn also taking to the social-networking site to share an image of them together.
Alongside the photo, he wrote: “In the studio w Phil Campbell tonight. We’re recording some straight greasy shit for everyone!!!”
It is currently unknown whether his guest turn for Campbell’s record will be for just one track, or whether he will be a more permanent fixture on the disc.
According to Blabbermouth.net, the likes of Judas Priest frontman Rob Halford and Ugly Kid Joe vocalist Whitfield Crane are also slated to appear on the LP.
The news comes following the death of Motörhead frontman Ian ‘Lemmy’ Kilmister, who passed away on December 28 following a short battle with cancer. He was aged 70.
Earlier this month, Campbell addressed Lemmy’s passing during an interview with fellow rocker Chris Jericho on his podcast, stating: “I’m still in shock actually. It’s like Slash told me, he was a constant. He’s always been here in our lives.
“At least he did it his way. I’m really proud of him. He lived as he wanted to live and there’s not a lot of people who can do that 100 percent.”
During the same chat, Campbell first revealed his plans to make a solo album, goading Jericho to sing on a track with him after he previously made a guest appearance on a Fozzy song.