Cronulla Sharks rugby league centre Ben Pomeroy has been charged with assault after a man's nose was broken at a Sydney rock concert last month.

Without naming the NRL player, police said a 23-year-old man had been charged with assault occasioning actual bodily harm.

"The charge relates to an assault at a rock concert at the Sydney Entertainment Centre on April 20," a police spokeswoman told AAP.

The 24-year-old victim told police he was punched in the face while in the crowd at a concert featuring American heavy rockers Korn.

The victim was treated by paramedics for facial injuries but was not taken to hospital, police said after the incident.

Four Sharks players - believed to be Pomeroy, Jacob Selmes, Dustin Cooper and Brett Kearney - were questioned, but released pending further inquiries.

Pomeroy's club refused to comment other than to confirm one of its players was involved in a police matter.

"The Sharks Rugby League Club wish to advise that as a matter involving one its players is now a police matter, no further comment will be made until the completion of the legal process," Sharks CEO Tony Zappia said in a statement.

Pomeroy is expected to play this Saturday when the Sharks take on the North Queensland Cowboys at Dairy Farmers Stadium in Townsville.

He is due to face Sydney's Downing Centre Local Court on June 19.

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