Paddy Jackson and Stuart Olding were cleared by a jury on a unanimous verdict last month following a nine-week trial in Belfast.
The news comes after the sporting organisations released a joint statement yesterday confirming that both players would have their contracts revoked following the Belfast rape trial.
It was deemed that the pair were in breach of the IRFU and Ulster Rugby's core values of the game - Respect, Inclusivity and Integrity.
The IRFU have added that a review of the existing structures and educational programmes within the game will be carried out.
Despite being acquitted, lurid WhatsApp messages sent by the players - which were used as evidence in court - have prompted a backlash from some who do not want to see them play for Ulster or Ireland again.
However, Jackson and Olding were not without their supporters either.
Jackson was also acquitted of sexual assault.
"I am ashamed that a young woman who was a visitor to my home left in a distressed state", Jackson told Press Association.
"However, I recognise that my behaviour has fallen far short of the values expected of me as an global player, a role model for the game of rugby and as a son and a brother", he added.
"I am very sorry this day has come to pass", he said.
London Irish have joined Clermont Auvergne on the list of clubs who have entered into talks with Paddy Jackson, who was sacked by Ulster Rugby and the IRFU on Saturday. "The treatment that I have received since my acquittal, both fair and unfair, has made me even more determined to prove myself".
Former Ulster and Ireland star Neil Best also felt the two players should be kept on by Ulster Rugby.
Public opinion and pressure from sponsors would be the reasons for the axing of Jackson and Olding from Irish rugby.
On Friday, there were protests outside Ulster rugby's grounds in Belfast, the first home game since Jackson and Olding's acquittal.
A group gathered outside the Kingspan Stadium where Ulster was playing Ospreys in the Pro14.
The demonstrators displayed messages to "stamp out" misogyny and sexism in sport and they are calling on rugby and other sporting bodies to address what they claim are prevailing misogynistic attitudes.