Ipswich Borough Council says it is in the process of trying to recoup rent from Ipswich Town.
BBC Radio Suffolk understands the club is £650,000 in arrears for the rent of their Portman Road home.
Last year an independent assessor concluded the bill should rise from £15,000 a year to £111,000 and be back-dated to 2004.
The council says it is prepared to "take steps", but the club have yet to make a statement on the issue.
Speaking in March, Town chief executive Simon Clegg unveiled the extent to which their rent had risen while defending a rise in season ticket prices.
"We've had a significant increase in our rent of 743%, increasing our annual rent from about £15,000 to £111,000," he told BBC Radio Suffolk.
"So reluctantly we've decided we've had to increase ticket prices by 6%."
The council is hopeful of coming to an arrangement with the club before next week.