Conor O'Shea says he will "absolutely not" replace Declan Kidney as Ireland boss.
The Harlequins head coach is one of two former Ireland internationals now coaching in the Aviva Premiership heavily linked with the position in the wake of Kidney's departure.
But O'Shea told the London Evening Standard he has no intention of leaving The Stoop, while Saracens have all-but ruled out their head coach Mark McCall.
O'Shea, preparing for Quins' Heineken Cup semi-final against Munster, told the newspaper: "Absolutely not. I am contracted to Harlequins until the end of the 2013-14 season. I will be honouring that commitment and, hopefully, continuing beyond it.
"Of course with the fixtures this weekend there are lots of questions but I've made my position very clear."
Saracens chief executive Edward Griffiths told the newspaper: "It is completely understandable that when jobs like this come up Mark's name is mentioned because he is one of the most successful coaches in Europe.
"However, just like the rest of our coaching staff, Mark recently signed a two-year extension and he remains totally committed to what we are doing at the club.
"We have not had any contact from the Irish RFU and our sole focus is the game with Ulster on Saturday."
But one man who is reportedly keen on the role is Ewen McKenzie, who became a candidate shortly after announcing he would step down as Queensland Reds head coach at the end of the current Super Rugby season.
The former Australia prop revealed his desire to coach the Wallabies, although he admitted he would welcome discussions with the Irish Rugby Football Union over succeeding Kidney.
"I am looking for coaching challenges at the next level and I am looking for whatever the possibilities are," McKenzie said. "It's the type of job I am interested in looking at but there have been no discussions.
"I have stated I would like the Wallabies job but it's all in the timing. There aren't many opportunities at Test level and you can't control the timing."