Barry Gibb will reportedly join the British band on stage, to guide them through a medley of Bee Gees hits.
A source explains to The Sun: “Chris was delighted to be asked to headline again but told Michael he wanted to bring some friends along, too.
“He agreed straight away. The band are putting a Bee Gees medley together cramming in all of their classics. It’s going to be really special. There are likely to be a few other surprise guests on the night too, which are still to be decided.”
Coldplay will become the first band to headline Glastonbury four times when they take to the iconic Pyramid Stage in June, while fellow headliner Adele will be making her Worthy Farm debut.
Muse are also headlining, and the full line-up announcement is expected in the next few weeks.
This year, the event’s site will be getting a mini makeover, as the John Peel stage, which is the largest enclosed tent area, is moving.
The new map will be released in the weeks leading up to the festival.