Sonisphere have added Deftones and Frank Turner to their already impressive line up.

Deftones drummer Abe Cunningham said: "Greetings to ALL!!! We are absolutely stoked to be part of Sonisphere's return and of course to have a chance to once again play a show with Iron Maiden, especially on the hallowed grounds of Knebworth. Until then...!!!!

While Frank Turner has told us: "I'm excited to be playing Sonisphere this year, and super excited to be playing the same stage as the first band I ever fell in love with - Iron Maiden; it's definitely going to be my festival highlight for 2014."

Frank Turner will be appearing at KNEBWORTH with his band as FRANK TURNER & THE SLEEPING SOULS, having recently completed an incendiary UK arena tour in support of fifth album 'Tape Deck Heart'.

Also added to the line up are:
Reel Big Fish
Protest The Hero
Alestorm
Truckfighters
Kerbdog
Max Raptor
Only Crime
Blitz Kidz
Itch
Hounds

Early Bird Weekend tickets for Sonisphere 2014 are on sale now priced at 170 pounds (limited availability). The highly popular deposit scheme will also be running from now until April, meaning fans will be able to reserve their tickets for an initial payment of just 50 quid. Check the Sonisphere website for further details.

Line Up So Far:

THE PRODIGY - IRON MAIDEN - METALLICA

AIRBOURNE
ALESTORM
ALICE IN CHAINS
ANTHRAX
BLITZ KIDS
CARNIFEX
CHAS & DAVE
DEFTONES
DEVIN TOWNSEND PROJECT
DROPKICK MURPHYS
FRANK TURNER & THE SLEEPING SOULS
GHOST
GOJIRA
HOUNDS
ITCH
KARNIVOOL
KERBDOG
LIMP BIZKIT
MASTODON
MAX RAPTOR
ONLY CRIME
PROTEST THE HERO
REEL BIG FISH
SILVERSTEIN
SLAYER
THE SISTERS OF MERCY
TRUCKFIGHTERS
THE VIRGINMARYS
VOODOO SIX