The announcement ends a week of internet speculation of rumoured acts to join the headliners Pearl Jam and Arcade Fire.
The new acts will join other international artists including Snoop Dog, The Lumineers and Major Lazer, as well as the recent ARIA award winners, Flume and Tame Impala.
Refunds are still available for ticketholders who are not satisfied with the acts announced to replace Blur.
The 2014 Big Day Out will be held in Adelaide at Bonython Park on Friday, January 31. Tickets are still available!