The Kent outfit sealed the League Two title with a 2-2 draw against AFC Wimbledon on Saturday but Allen is now turning his attention towards next season's prospects.
Looking towards the success enjoyed by other teams following League One promotions, the Gills boss is relishing the chance to continue the club's progress.
He told the club's official website: "I need some time now to get the team together and build for next season.
"I want to challenge and make it good for our supporters and players.
"We want to continue the roll we are on. Norwich and Southampton went from Division One to the Premier League and I don't think we should set our vision for the future any lower."