The Surrey punk-poppers are currently in Los Angeles making their third album at the Sound Factory studios.
Frontman Josh Franceschi has now confirmed that the Bring Me The Horizon star has recorded vocals on a track.
He told Rock Sound: “Mr Sykes came down and he just tracked some vocals on one of our songs. But it wasn’t very good so we’ll probably ask someone else to do it. No I’m joking, it sounds sick.”
The band had previously said that they were keen for Paramore star Hayley Williams to guest on the album.