A former Muslim cleric has been found guilty of marrying off an under-aged girl to an adult man in Melbourne.

Magistrate Phil Goldberg said on Thursday he found Ibrahim Omerdic solemnised the marriage of the girl and a 34-year-old man.

Omerdic, who was an imam of the Bosnian Islamic Society and Noble Park Mosque, had fought the charge, claiming the 'marriage' was not subsequently formalised under Australian law.

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Magistrate Phil Goldberg said on Thursday he found Ibrahim Omerdic (pictured) solemnised the marriage of the girl and a 34-year-old man

'I'm satisfied the prosecution has proved all elements of the charge,' Mr Goldberg said on Thursday.

Video of the ceremony was screened previously in the Melbourne Magistrates' Court, and Omerdic could be heard telling the girl's mother and her betrothed that she was 'very young'.

'As a wife you have a duty to obey your husband,' he told the girl in the video.

Ibrahim Omerdic (pictured) solemnised the marriage of an underaged girl and a 34-year-old man

Omerdic is pictured in footage of the marriage which happened at the back of a Melbourne mosque

Omerdic was sacked after his arrest in November and his marriage licence certificate was revoked.

He told police he thought the girl was 17 and he did not consider the pair officially married as he had not seen their ID and proof of age.

Omerdic's bail was extended and the matter returns to court on June 21.

Omerdic is pictured in video of the marriage between the underage girl and the man 20 years her senior