Bail has been formally refused in the case of a Sydney man who allegedly tried to kidnap a woman a week ago and is also charged with assaulting several men in a pub in a separate case yesterday.

Dean McGlinchey, 26, from Belrose on Sydney's northern beaches was detained by police in Frenchs Forest yesterday, after his car was spotted following a serious assault in nearby Dee Why.

Police said McGlinchey assaulted a man at a hotel in Dee Why — allegedly hitting him over the head with a bar stool.

The 54-year-old man received serious lacerations to his face, lost his front tooth and has had to undergo surgery.

McGlinchey's father was also charged in relation to the Dee Why matter.

Court documents in Parramatta's bail court show he has also been charged with assaulting two men in Terrey Hills a short time before the incident in Dee Why.

On the run after attempted kidnapping

Court documents show McGlinchey had also used the same car spotted by police allegedly trying to kidnap a Taiwanese woman in Burwood in Sydney's west a week ago.

The 27-year-old woman was only in Australia for a short time.

Police said McGlinchey allegedly punched the woman in the face and tried to push her into his car boot.

A passing motorist stopped to help, reportedly allowing the woman to escape.

McGlinchey did not appear in court today and did not apply for bail.

His lawyer has requested a medical assessment whilst he is in custody.

The matters return to court this week.