15/02/2017 2:27 PM AEDT | Updated 15/02/2017 5:07 PM AEDT

'This Is Not Grant Hackett': Family Concerned For Olympian's Health After Arrest

The troubled swimming champ was released after a few hours in custody.

Mike Segar / Reuters
Olympic swimmer Grant Hackett has reportedly been arrested.

Troubled Olympic swimmer Grant Hackett has been released without charge after being arrested on the Gold Coast Wednesday afternoon.

The 36-year-old swimming champion's family have expressed concerns for Hackett's mental health after police were called to the family home.

Hackett's brother told Channel Nine that Grant Hackett was suffering from chronic mental health issues.

"It looks like it won't go away in an hurry, so from a mental health perspective I hope something can be done," he said.

"This is not Grant Hackett. This is a completely different person. I don't know this person. My mum and dad don't know this person."

Hackett was released from the Southport police watchouse on Wednesday afternoon without charge.

In April, the gold medalist issued an apology for "poor behaviour" on a domestic flight amid allegations he tweaked the nipples of another passenger while flying to Melbourne.