Paddy Whiskey have admitted that they are reviewing their partnership with London Irish in the wake of the club's decision to sign Paddy Jackson this summer.
In response to an enquiry on their Facebook page from a concerned fan, Paddy Whiskey explained that they are treating the issue as "a matter of urgency", with two major sponsors of London Irish already withdrawing their support for the club in the wake of Jackson's signing.
"We have no input into team selection or signings, but we will be reviewing our partnership with London Irish in the coming weeks," Paddy Whiskey said on Facebook.
"We have shared your concerns with London Irish as a matter of urgency."
The former Ireland outhalf saw his contract terminated by Ulster last year following the conclusion of a trial in which he was found not guilty of rape.
He subsequently signed for French side Perpignan but activated a clause in his contract allowing him to leave the club following their relegation from the Top 14.
On May 7, newly-promoted London Irish confirmed that they had reached an agreement to sign Paddy Jackson for the 2019/20 season, sparking protests from fans as they urged sponsors to consider their patronage of the club.
Paddy Whiskey would be the third sponsor to drop London Irish in the wake of Jackson's signing, with drinks giant Diageo joining Cash Converters in withdrawing support for the Gallagher Premiership club earlier this week.
The decision of Guinness parent company Diageo to cut off their support of the club was particularly notable as it brought and end to a 27-year relationship between the two organisations.
Paddy Jackson is not the only new signing London Irish have made ahead of their return to England's top tier, with Irish flanker Seán O'Brien, New Zealand winger Waisake Naholo and Australian duo Nick Phipps and Sekope Kepu also heading to the Madejski Stadium.
