In recent years, one or more teams from the professional leagues have normally failed to meet the regulatory or financial requirements in order to participate. This usually creates vacancies that get announced in the summer rest period as the new season is being organized. As teams move up to fill the void created by these failed teams or teams in the lowest professional division fail, spaces are created in Serie C (or Lega Pro Seconda Divisione prior to the 2014–15 season) that need to be filled.