Teen critical after punch in Sydney

A teenager is in an induced coma after allegedly being punched outside a McDonald's in Sydney's west.

Alexander McEwen, 19, and his brother Lance McEwen Henderson, 21, were standing on top of a one-metre-tall retaining wall at the fast food restaurant's car park in Penrith when they were allegedly approached by a man about 1.30am (AEDT) on Saturday.

Police say the man punched both brothers, knocking the younger McEwen over the wall where he struck his head and lost consciousness.

The teen was rushed to Nepean Hospital where he is in critical condition with a fractured skull and damage to his spine.

His brother Lance suffered injuries to his face, including a cut lip.

Their alleged attacker, Corey Beard, 21, appeared at Parramatta court on Sunday where he was granted conditional bail.

Beard was charged with offences including recklessly inflicting grievous bodily harm to the teenager as well as assaulting his brother.

He was also charged with possessing steroids after police allegedly found 13 vials of the drug during a search of his home on Saturday.

During the bail application, Sergeant Belinda Laughton told the court the alleged assault had been captured on CCTV and there was a strong prosecution case.

But the Legal Aid lawyer representing Beard said he had told police that he had acted in self-defence.

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Teen critical after punch in Sydney