The grievance is in relation to an alleged failure to inform and consult over the transfer of contracts from the old company to Charles Green's new company.
In their share issue prospectus, Rangers declared that PFA Scotland – the union for professional footballers – had raised the claims and that the club would defend this "robustly".
The prospectus also states that former Ibrox players Sone Aluko, Kyle Lafferty and Jamie Ness have raised constructive dismissal claims.
The three players were among nine who refused to transfer their contracts over to Green's company, which bought the club's assets and business after oldco Rangers, now called RFC 2012, were consigned to liquidation in June.
PFA Scotland declined to comment. But it is believed the claims were brought in a strategic move as part of an arbitration battle between the club and PFA, which will be decided by the Scottish Football Association.
Rangers are demanding compensation over the Ibrox exit of six of the players who declined to join the new company.
The club said a preliminary hearing had been fixed for January 7 with a full hearing expected in March or April if they win the right to continue their challenge.