Manly will investigate an incident involving two coaching staff members who have reportedly fought each other outside a Sydney pub.

"The Manly Warringah Sea Eagles have been made aware of an incident involving two members of our coaching staff yesterday evening," the NRL club said.

"The club has commenced an internal review into the matter. We have notified the NRL integrity unit that we have commenced our review and will keep them fully informed."

Fairfax Media reported assistant coach Willie Peters and head of physical performance Dan Ferris had to be separated by police on Wednesday night during a brawl outside the Orient Hotel in The Rocks.

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NSW Police say two men, aged 38 and 31, had refused to make statements or assist police with their inquiries after the fight at 7pm.