Christian Martucci will fill in for Root. The band broke the news on their Facebook page. The band said, "
A new Slipknot album will be the band's first since 2008's All Hope is Gone. Since that time, Root has been spent a lot of time touring and recording with Stone Sour.
It is unclear why Root needs time away to write for a new Slipknot album while Corey Taylor, lead singer of both bands, does not.