According to the sources, Griffin and the equipment staffer got into an argument in a restaurant during the team's trip to Toronto. Griffin hit the man, who then left the restaurant and went outside. Griffin followed him outside and hit him again.
Griffin suffered a suspected fracture in his hand in the incident, sources told ESPN's Marc Stein and Ramona Shelburne early Tuesday morning.
The equipment staffer's face was injured, sources told Eaves. Both Griffin and the equipment staffer were sent home after the incident.
Sources told ESPN that the hand injury is expected to keep Griffin out "a matter of weeks, as opposed to days."