Guinness has sponsored London Irish for almost 30 years – their association started in 1992 – but they are now set for important talks.
The brewing giant claims the presence of Jackson on the Irish roster is a concern.
In a statement to the Irish Daily Mail, the sponsor said: “We are meeting the club this week to discuss our serious concerns regarding their decision, which is not consistent with our values.”
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Cash Converters announced last week it would not continue its association with the newly-promoted Gallagher Premiership club, tweeting: “As a company, we are committed to the highest possible standards when it comes to our investments in any sponsorships and collaborations.
“As a result of a detailed and thorough review of our support for London Irish, we have decided to discontinue our association with the club.”