The 19-year-old man was injured during an incident near to Tokyo Joe's in Westburn Street at 2am yesterday.
Detective Sergeant Gordon Gibson, of Greenock CID, said: "There was a disturbance and during that disturbance, a 19-year-old male suffered an injury to his ear."
A 22-year-old man is expected to appear at Greenock Sheriff Court on Monday in connection with the incident.
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