Accused stabber of Sydney teen behind bars

A man has spent the night behind bars after allegedly stabbing a teenage boy outside a supermarket in Sydney's inner west.

Jeremy Allen, sporting a bandaged left hand, faced Parramatta Bail Court on Sunday after he allegedly confronted a 16-year-old boy and his 14-year-old brother outside Woolworths in Balmain.

He reportedly asked for a cigarette lighter then allegedly gashed the 16-year-old, puncturing his abdomen.

The 29-year-old has been charged with causing wounding and grievous bodily harm with intent to murder among other offences.

His solicitor, Ronnie Naidoo, told the court Allen had a "very strong argument for self-defence".

But, prosecutor Amber Hawkins said Allen fled the location, changed appearance, didn't hand himself in, had previous violence-related offences and had breached AVOs in the past.

He was refused bail by Magistrate John Favretto and will remain behind bars until September 11 when he is due to face Central Local Court.

Allen's partner, Cassandra Ross, 23, who was allegedly also in the car park, did not apply for bail at Parramatta Bail Court on Sunday.

She will face Central Local Court on Wednesday accused of concealing a serious indictable offence.

The 16-year-old injured boy underwent surgery at Royal Prince Alfred Hospital and remains in a stable condition.