Michael Clifford applies for emergency passport

Pop star Michael Clifford has filed a petition at the Australian embassy in a bid to gain emergency travel documents to join his 5 Seconds Of Summer band on tour after losing his passport over the weekend (06-07Dec14).

The guitarist misplaced his official documents moments before boarding a plane from New York to London, where the Sydney natives were scheduled to perform at Sunday's (07Dec14) Jingle Bell Ball.

He was unable to locate his papers, prompting him to miss the flight, leaving bandmates Ashton Irwin, Luke Hemmings and Calum Hood no choice but to press ahead with the gig without him.

Taking to Twitter.com, Clifford apologized to fans and wrote, "Really, really sorry for anyone who I've let down for not being able to come. You get a free pass to call me stupid."

He has since turned to Australian embassy officials for help so he can catch up with the group. In the meantime, 5 Seconds of Summer are expected to play another show in Liverpool, England on Wednesday (10Dec14) as a three-piece.

Hemmings has since revealed Clifford managed to lose his passport within minutes of it being handed to him by the group's manager - and he can't believe how scatterbrained his pal is.

Speaking to Britain's BBC Radio 1, he explains, "Our tour manager holds our passports and will give it to us before the flight. Then we'll have it for maybe an hour and then he'll take it back off us. In that time, he's lost it."

He adds, "I've seen Michael lose a ticket before he gets on the plane, I mean he's given it in the line and he's lost it."

Clifford will be able to rejoin his bandmates this Friday (12Dec14), when they are scheduled to return to the U.S. to perform at a Jingle Ball show in New York. They will then head to Boston, Massachusetts and Washington, D.C. for similar concerts.