By By Kev Hedges Mar 20, 2011 in Sports Bermondsey - A football fan celebrating his team's goal has plunged 20ft from the upper tier of south London's Millwall stadium, the New Den. The Cardiff City fan's condition was serious but stable and paramedics have said he is "very, very lucky". Police and medical staff treated the fan at the scene for around 20 minutes following the opening goal in a match that ended "We don't know much about him, but all we'll say is that we as a club send our best wishes for a speedy recovery", he added. The The The incident happened as Championship sides Millwall hosted Welsh club Cardiff City. In the away fans' enclosure, eye-witnesses saw a 30-year-old Cardiff fan celebrating his side scoring, when they saw him stumble over the railings and drop 6m (20ft) onto a row of seating in the tier below.Police and medical staff treated the fan at the scene for around 20 minutes following the opening goal in a match that ended 3-3 . Play did not stop while the fan was being attended to but Cardiff City manager, Dave Jones said that one or two of his players had witnessed the fall, as it happened, "I couldn't give two hoots about the result after that. One or two of the players saw it, and Craig (Bellamy) said it made him feel physically sick.", he said."We don't know much about him, but all we'll say is that we as a club send our best wishes for a speedy recovery", he added.The BBC Reports that the fan was taken to a south London hospital in a serious but stable condition and police have confirmed that no one has been arrested as investigations are still ongoing.The Daily Mail reports police are not treating the incident as a criminal matter and the man's condition has already begun to improve. London Ambulance said, "His injuries are not life-threatening. He is a very, very lucky man." More about UK football, Millwall, upper tier, cardiff city, Fall More news from UK football Millwall upper tier cardiff city Fall