The Pompey Supporters' Trust has exchanged contracts with administrators to buy Portsmouth, but the takeover is still dependent on the group taking control of Fratton Park, reports BBC Sport.
The League One club has been in administration since February 2012 and is said to be £61m in debt.
Administrators PKF will head to the High Court on 10 or 11 April to try to force the sale of Fratton Park.
Trust chairman Ashley Brown said the PST was "confident of success".
If the court ruling goes in its favour, the PST takeover will go ahead.