One of two brothers accused of bashing an assistant police commissioner has been granted bail, despite police concerns that the young man’s father had intimidated his employer.

Isaiah Stephens, 18, and his brother Jay, 20, are charged with assaulting Assistant Police Commissioner Chris O’Neill in the grounds of St Kevin’s College in Toorak last Saturday, after the pair had been asked to get off a train for unruly behaviour.

Sporting a hoodie on his head and a swastika on his finger Isaiah Stephens leaves court on Friday. Credit:AAP

Mr O’Neill, who was off duty and attending a private function at the school, followed the pair from Heyington train station until the brothers allegedly confronted him and bashed him.

Mr O’Neill, 60, suffered three fractured ribs and bleeding on the brain and was treated in hospital but has since been released.