In the latest blow to upcoming dance music festival Ultra Singapore, one of the headline acts - Dutch DJ Martin Garrix - has pulled out of all upcoming shows following a serious ankle injury sustained recently.

Garrix, one of the top-ranked DJs in the world, shared a photo of himself in a wheelchair with his right leg in a cast on his Instagram account on Wednesday.

A statement accompanying the post said he suffered a serious ankle injury on May 25 during a show in Las Vegas.

It said: "Even though (he was) feeling positive after some days of rest, further examinations have determined that all his ankle ligaments are torn and surgery is needed to prevent permanent damage to his ankle.

"Therefore, Garrix is forced to follow the specialist's advice and cancel all his shows for at least the upcoming four weeks."

The fourth edition of Ultra Singapore, which is due to take place tomorrow and Sunday, saw a venue change announced on Tuesday.

It was moved from its usual outdoor venue of the open field next to Marina Bay Sands (MBS) Tower 1 to a smaller venue indoors, in the basement of MBS' Sands Expo and Convention Centre.

In a post on Wednesday on Ultra Singapore's Facebook and Instagram pages, organisers cited "expected severe weather" for the venue change.

But some are unconvinced and demanded refunds, while others have expressed disappointment with the change to the smaller venue.

Set timings for the remaining acts have also yet to be released as of yesterday morning.