League One Livingston have been charged with fielding an ineligible player in their Irn Bru Challenge Cup victory at Northern Irish side Crusaders.
Defender Alan Lithgow played the full 90 minutes in Livi's 2-1 victory which sent them into the quarter-finals.
But it has been reported to the SPFL that the 28-year-old played while under a Scottish FA suspension, having been sent off at East Fife on 24 September.
Livingston have been requested to attend an SPFL hearing on 24 October.
The West Lothian club are due to face Welsh side The New Saints in the Challenge Cup quarter-finals on Sunday 13 November.