Police have charged a man after he allegedly raped a woman over four days while holding her captive following an online hook-up.

Victoria Police allege Robert Wilson, a 32-year-old from Darley, connected with the Vietnamese national on an online dating app called “Badoo” several months ago.

According to police the pair met on March 25 at a suburban business before he allegedly took the 39-year-old captive at his home.

A man is in custody after a woman was allegedly detained, sexually assaulted and threatened with a crossbow during an online dating hook-up. (9news)

The victim said Wilson picked her up from her Ivanhoe workplace and took her to his Grey Street home in Darley, where he allegedly punched her in the head and face as she sat in his living room.

"The victim was then imprisoned inside the property and threatened with a number of weapons, including a crossbow," police said in a statement.

Friends of the woman contacted the man asking about her whereabouts and he allegedly let her go on Friday.

She then went to a friend's house and was taken to hospital suffering serious head and facial injuries.

The property in Darley where the alleged abuse took place. (9News)

Wilson was arrested yesterday by officers attached to the Sexual Crimes Squad. He has since been charged with false imprisonment, intentionally causing injury, recklessly causing injury, theft and three counts of rape.

He faced Melbourne Magistrate’s Court last night but refused to front the magistrate with his lawyer telling the court his client was content remaining downstairs.

Wilson did not make a bail application and was has been remanded to appear again on 5 April.

Police are appealing for anyone with further information to contact CrimeStoppers on 1800 333 000.

Police are appealing for anyone with further information to contact CrimeStoppers on 1800 333 000.