Dallas and Gannon are involved in a war of words about the latter's letters
Jim Gannon has continued his spat with the Scottish FA by accusing the head of refereeing development of questioning his "honesty and integrity".
Hugh Dallas says he has only received one letter from the Motherwell manager, who claimed he had written two outlining his concerns about referees.
Gannon has now written another letter to the SFA asking for clarity.
"I will await their explanation - and any evidence they have to support their position," he said.
Gannon claimed after Saturday's 2-2 draw with Dundee United that he had twice written to Dallas in relation to refereeing performances and his correspondence had been ignored.
They question the honesty and integrity of my post-match statements on Saturday 28 November
Motherwell manager Jim Gannon
Dallas refuted those claims, saying he had received one letter, which was responded to immediately.
"I am disappointed by the comments made by Mr Hugh Dallas of the Scottish Football Association and an unnamed spokesman representing the SFA, in which they question the honesty and integrity of my post-match statements on Saturday 28 November," said Gannon on the Motherwell website.
"I have written to Mr Hugh Dallas and Mr Gordon Smith, as the chief executive of the Scottish Football Association, to seek some clarity on this matter.
"I once again reiterate that two separate letters of complaint regarding the standard of referees were sent to Mr Hugh Dallas, in his role as head of referee department of the SFA, dated 21 September and 19 November.
"Both parties have been furnished with a copy of each of the two letters for their records."
Gannon's original comments following the sending off of two United players during Saturday's game, after which he and opposing manager Craig Levein criticised referee Alan Muir.
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