The man accused of raping and murdering Sydney teenager Mahmoud Hrouk has denied any involvement in the crime and fears for his safety while being held in custody, his lawyer says.

Aymen Terkmani, 22, of Fairfield East, was arrested on Thursday and charged with murder and aggravated sexual assault.

He did not appear in person before Fairfield Local Court on Friday.

Mr Terkmani's lawyer, Fadi Abbas, did not apply for bail on Friday but said outside court he planned to apply later.