And following a performance in which Poite penalised Ireland 14 times, twice as many as Italy, the Frenchman came under fire from Ireland coach Declan Kidney for a lack of impartiality.
But after it was denied by the IRB, Mallett has now revealed he did not receive any such letter.
"I am happy to put the record straight after I was reported as saying that Romain had written to us last year," said Mallett, who looks set to leave Italy after this year's World Cup.
"I have already apologised to Romain. I did not intend to put undue pressure on him prior to our match last week but accept that this may have been a consequence."