Hearts have been placed under a Scottish Premier League transfer embargo - a decision made before the club failed to pay wages on time for the second time this season.
Six members of the club's playing squad have yet to receive their full wages, which had been due on October 16 - the second month in a row this has happened.
It is believed the SPL board imposed the embargo, allowed under new rules this season, after the original September breach, but the sanction has not been made public until now.
Neither the SPL nor Hearts would comment on the matter or why the decision had been kept private.
The sanction means forward Rudi Skacel, who is training with the club he left for a second time in May, would currently be unable to sign for Hearts boss John McGlynn if offered a deal.
The SPL board are scheduled to meet on Monday, with the situation at the Edinburgh club on their agenda.
It is understood the Hearts players affected - the club's higher earners - are prepared to wait, hoping for a quick resolution now that the issue has been raised with the SPL.
Hearts faced similar problems last season after three straight months of delayed wages prompted an official complaint from the players to the SPL via the PFA Scotland union, only for the possibility of action to be averted in January when the club met demands imposed.
However, the issue arose again in March, with players and staff receiving their salaries 12 days late.
Information from the Press Association was used in this report.