A visitor to the island has admitted common assault after punching a bouncer at the casino.
Ryan Paul Colclough had been refused entry by security staff.
The 27-year-old will be sentenced on September 6 after a probation report has been prepared.
Prosecuting advocate Rachael Braidwood told the court that the complainant in the case was working as security staff at the Best Western Palace Hotel on July 17.
At 1.45am, Colclough was seen stumbling at the entrance to the casino and was subsequently refused entry.
He was escorted outside but then tried to get back in.
Staff continued to tell him to leave but Colclough continued to try to walk past them.
One of the bouncers pushed Colclough back which prompted him to throw a punch, hitting the security man in the face.
He was subsequently restrained until police arrived to arrest him.
When interviewed at police headquarters, Colclough, who lives at John Ritchie Street, Stoke on Trent, handed in a prepared statement claiming self-defence, saying he had been scared by the security officer.
Colclough claimed he had suffered injuries to his lip, forehead and back.
The court heard that he has previous convictions, in 2019 for common assault, and in 2014 for resisting arrest.
CCTV footage from the Palace Hotel showed the punch being thrown.
Defence advocate Jim Travers handed in letters of reference for his client and said that Colclough had travelled to the island to deal with the matter.
Mr Travers said that Colclough had spent a night in custody after his arrest.
High Bailiff Jayne Hughes adjourned the case so that a probation report can be prepared and asked for more information regarding the 2019 offence to be provided.
Bail was granted in the sum of £500 with conditions to live at his home address and to contact probation.