Celtic have reportedly launched a probe after a document appearing to show the club's transfer plans was leaked online.
The dossier, allegedly from a recruitment meeting in April, was circulated on fans' forums and appears to detail in-depth potential key targets for this summer's transfer window.
The Scottish Sun reports Parkhead chief Peter Lawwell and boss Neil Lennon have been made aware of the breach.
It's also claimed the Hoops will treat the leak as a criminal matter.
The details include several potential signings and departures and includes initials of staff members in attendance.
The Premiership champions have been plagued with leaks this season, with their starting XI for several high profile clashes getting out ahead of time.
Celtic face a pivotal summer with a host of first-team stars reaching the end of their contracts or returning to their parent clubs.
Top players have also attracted transfer interest from clubs in England and abroad.
Ukraine winger Maryan Shved will link up with the Hoops squad following his move from Karpaty Lviv.
West Brom midfielder Rekeem Harper has also been scouted, while Charlton's Joe Aribo is a rumoured target as is Girona striker Christhian Stuani.
Meanwhile, Marseille could bid for Olivier Ntcham and Kieran Tierney is a reported priority for Leicester City and Arsenal.
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