Recent reports claimed the 43-year-old left the function after he was asked to take part in some party games.
But both manager and the club have since moved to deny all speculation in a joint statement.
"On Monday evening, the club arranged its official Christmas Party for all employees and staff. We have many hard-working employees and this was an opportunity for them to relax and enjoy themselves after what has been a difficult year," Berg told the club's official website.
"After the dinner I was asked to go to the stage, which I was happy to do, believing I would be asked a few questions or maybe judge a competition.
"Instead I was asked to do things which were not the right things for me to do as the manager, considering our league position and form. I did not want to do it and went back to my table.
"Later, I left the event at around 9.30pm, as planned, and drove home. The players left straight after dinner and no alcohol was consumed."