William's son was christened on Wednesday and the proud dad spoke about sitting with the baby prince as Aston Villa "thrash" Premier League champions Manchester United.
The royal also joked about his anxieties ahead of a competitive football match that was staged at Buckingham Palace earlier this month, hinting at worries the Queen's garden might have turned into a bog.
In his message William spoke with pride about being president of the Football Association, saying soccer was a "huge force for good and a lot of people love, respect and enjoy their football more than anything else in their lives".
The royal's video message is released exactly 150 years since the FA was founded.
Watch the video:
William will attend a FA gala dinner tonight to mark the anniversary, with the event staged at the Grand Connaught Rooms in London - the site where the founder fathers of English football met in 1863.
The video will by played during the dinner and William is due to give a speech.
Ebenezer Morley, a solicitor and sportsman, was the driving force behind the meeting on October 26, 1863 that led to the establishment of the governing body of football in England.
In the video the Duke was asked if he would take baby George to Villa's ground in the near future and the royal smiled and said: "When Villa thrash Man U at Villa Park, my son will be there."
William helped organise the competitive game at Buckingham Palace between two of England's oldest amateur clubs, Civil Service FC and Polytechnic FC, as part of the 150th anniversary celebrations.