An incident between Moyes, 51, and a 23-year-old man is said to have happened in Clitheroe, Lancashire, at about 10pm yesterday.
A spokesman for Lancashire Constabulary said: “Police are investigating a report of an assault at the Emporium wine bar in Clitheroe.
“Officers attended the bar at about 10pm yesterday and it was reported that a 23-year-old local man had been assaulted by a 51-year old man. He did not require hospital treatment.
“Inquiries are ongoing and we are speaking to a number of people to try to establish the circumstances.
“There are a number of differing accounts which we need to work through to try to establish exactly what has happened. No-one has been arrested at this stage.”