The veteran Oxford rockers will continue their ten year anniversary celebrations by filling the Sunday slot on the Pyramid Stage - made vacant recently by Pete Doherty's rehab quest to Thailand.
Supergrass have been confirmed to play third from top of the bill (at around 7.15pm) on the closing night.
They now precede Morrissey and Muse – following the not-so-shock announcement last week that the Libertines were cancelling all their June festival dates, which also included the Isle of Wight and Meltdown.
Click here for the full Glastonbury line-up.
The Libertines have apparently put everything on hold while Doherty tries to beat his well-documented drug addiction at the Thamkrabok Monastry in Thailand.
But, according to reports, Doherty has already skipped the centre’s harsh regime (beatings with bamboo sticks are apparently the norm!) and he is now holed up in a hotel in Bangkok.
The Glastonbury Festival 2004 takes place between June 25-27 at Worthy Farm, Pilton.