Louis Tomlinson has lost his voice.

The One Direction star has sparked fears he will miss the band's show in Perth, Australia, on Sunday night (29.09.13) after being struck down by an illness.

The 21-year-old singer tweeted on Saturday (28.09.13): ''Lost my voice :(''

The 'Best Song Ever' hitmaker previously revealed he was struggling to get over his jetlag after flying Down Under.

He tweeted on Wednesday (25.09.13): ''Still not managed to get into the time zone :( feel like a zombie.''

Australian police investigated One Direction earlier this week after their entourage allegedly sped through three red traffic lights.

The incident is said to have happened during a night out in Perth, and the Western Australia Assistant Commissioner Nick Anticich revealed an investigation is underway.

He said: ''It's unacceptable behaviour. It breaches the law and we will deal with every person in the same way.

''By virtue of the fact that they are rock stars is not a license to break any laws or be any different from anyone else. One Direction they may be, but the only direction in relation to this type offending will be to the courts.''

The group - which also includes members Liam Payne, Zayn Malik, Niall Horan and Harry Styles - kicked off the Australian and New Zealand leg to their Take Me Home World Tour on September 23 and will wrap up their tour dates there on October 30th in Melbourne before moving on to Japan.