The victim, 24, was taken to Hull Royal Infirmary after the incident outside Georges Bar, Market Walk, at 3.20am this morning (Monday).
He sustained serious but non life-threatening injuries .
Police said a 39-year-old man has been arrested on suspicion of assaulted and remains in custody.
A Humberside Police spokesperson said: "Localised enquiries have been conducted and a number of witnesses have been identified.
"Any witnesses who have not spoken to the police should call us on 101 quoting log 77 of 17/04/17."