Purdie's first spell at Hereford ended when he joined Darlington in June 2007
The Football League has charged both Torquay United and Hereford United with fielding unregistered players in their match at Plainmoor on 1 February.
Torquay played Jake Robinson in the game, while Hereford fielded Rob Purdie, despite neither being registered after signing on 31 January.
Both clubs had missed the 1200 GMT cut-off point for player registration on the day before the match.
The clubs will be dealt with at a hearing on a date yet to be arranged.
Purdie, 28, signed for Hereford on 31 January until the end of the season following his release by Oldham.
It was a genuine administrative oversight in the very hectic hours leading up to the transfer deadline, which the club reported to the League as soon as it was discovered
Hereford United statement
The Bulls released a club statement on Tuesday, saying: "Hereford United have submitted a detailed explanation to the Football League concerning the signing of Rob Purdie, which has led to a charge against the club of fielding an ineligible player in the match at Torquay on 1 February.
"Purdie was one of three signings made on 31 January and the club say confusion arose because all three were subject to different deadlines.
"It was a genuine administrative oversight in the very hectic hours leading up to the transfer deadline, which the club reported to the League as soon as it was discovered.
"The case will be heard by a football disciplinary commission in the near future and the club will be asking for a personal hearing."
Hereford triumphed in last Tuesday game, coming from behind to win 3-1 after Robinson had scored 10 minutes into his Gulls debut.
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