Fans have been mailed 'boarding passes' with a check-in time of 21 February at 6pm. The fake tickets are from Obelisk Airlines and depict the Foo Fighters logo wrapped up in a pyramid.

The band have been rumoured constantly since being forced to pull out of the 2015 event after frontman Dave Grohl broke his leg.

OMFG.... put everything on hold people!!! ANOTHER clue for @foofighters #Glastonbury2017 pic.twitter.com/F48pmrxRKC

— SHAZZA (@shazza_belle) February 18, 2017

Anyone else get a special delivery from @foofighters today?? #glastonbury2017 pic.twitter.com/u2N7QqKK2c

— RachMcP (@RachMcP72) February 18, 2017

If this mysterious announcement is indeed Glasto related, it adds weight to a report in The Sun which confirmed the two final bill-toppers: Grohl & Co. and Ed Sheeran.

In other Glastonbury developments, organiser Emily Eavis promised "twice as many bands" and Michael Eavis reckons his new addition is "the biggest thing of the year." Earlier this year a big legend confirmed he'll be performing at this year's bash, and Wiley recently revealed he'd be headed back.

Radiohead are the only officially confirmed act for Glastonbury 2017 so far, with The Avalanches set to play according to themselves. Phil Collins, Depeche Mode, Guns N' Roses, Foo Fighters, Kraftwerk, Daft Punk, and The Stone Roses have been linked with this year's event in the past few months, while Little Mix and Lady Gaga have also expressed interest in performing.