Gareth Jenkins has questioned the "ethics and integrity" of the Welsh Rugby Union panel that spurned his application to become Wales coach. "They disrespected my values and virtue," said Jenkins, who says he should have been told of the decision before Mike Ruddock got the job.
He accused an unnamed member of the WRU's five-man selection panel of "a complete lack of integrity".
Jenkins claims confidential information was leaked in the interview process.
The Scarlets coach says that he was phoned at 1200 GMT on the day of Mike Ruddock's appointment to ask if he could take a call at 1430 GMT, but that he could not because he was at a funeral. "Why couldn't I be told at 1200 that I wasn't required?" said Jenkins. "I think I was treated badly."
"If I was not the chosen candidate I was comfortable with that, it was the panel's choice.
"Where I felt let down was that if I wasn't the candidate of choice then I felt I was entitled to know.
"Obviously someone was comfortable spinning with the emotions of the public, myself and Mark Evans when knowing quite well that I was not an option to go with."
Scarlets chief executive Stuart Gallacher disputed the Union's assertion that going outside of a shortlist of two to appoint was standard business practice.
He said that successful businesses were based on mutual trust.
"We will back Mike Ruddock as the national coach of Wales, this is not a witch-hunt against him," said Gallacher.
"But the Union need to reflect that they could certainly have handled this a lot better."