Hearts will tomorrow be the subject of a meeting of UEFA's control and disciplinary body after their fans encroached on to the pitch during the Europa League clash with Liverpool at Anfield.
Supporters from the away end spilled on to the playing surface when David Templeton scored in the 1-1 draw with Liverpool on 30 August.
The 84th-minute goal levelled the tie on aggregate, but Luis Suarez then struck as Hearts exited the competition.
A UEFA statement read: "UEFA has opened disciplinary proceedings against Heart of Midlothian FC for `field invasions by supporters' at last month's UEFA Europa League play-off second-leg match between Liverpool FC and the Scottish club.
"The case will be heard by the UEFA control and disciplinary body on Thursday."
Meanwhile, Hearts have informed the Scottish Premier League of the delayed payment of wages to a number of first-team players, who did not receive their monthly salaries on schedule this week.
Under financial regulations, member clubs are required to inform the SPL of matters such as delayed payment of player wages.
The salaries for a small number of the Edinburgh club's top-earning players remain outstanding.
Hearts said they were seeking to swiftly resolve the issue, which has resurfaced after a number of similar delays last season.
Last term, three straight months of delayed player wages prompted an official complaint from the players, via union PFA Scotland, to the Scottish Premier League, but action was averted in January after Hearts met the demands imposed.
However, the issue reared its ugly head again in March, when players and staff received their salaries 12 days late.
Hearts attributed some of last term's delays to logistics transferring the funds from Lithuania, where majority shareholder Vladimir Romanov is based.
The latest delay comes after a month which featured a glamour Europa League tie with Liverpool, while all 12 Clydesdale Bank Premier League clubs are awaiting the latest instalment of television revenue amounting to £300,000 per club.