Businessman Seán Quinn is to leave his advisory role with Quinn Industrial Holdings Ltd - the company that acquired the building materials and packaging divisions of the former Quinn Group.
His son, Seán Quinn Jnr, will also be departing from his advisory role with the company.
In a statement QIHL said: "It has been mutually agreed between the parties that QIHL's consultancy arrangement with Seán Quinn and Seán Quinn Junior will be discontinued".
However, Mr Quinn will still have access to QIHL office facilities for his own personal use.
QIHL said that it "entered into a consultancy agreement as a framework to facilitate Seán Quinn's involvement in the businesses", but that "as time has progressed it has become evident that Seán's expectations for his role and the ownership structure of QIHL are at odds with the strategic direction of the businesses".
QIHL acquired the building materials and packaging divisions of the former Quinn Group from Aventas in December 2014.
Aventas, comprising former Quinn creditors, itself acquired Quinn Packaging after the family lost control of the group in 2011, with outstanding debts of around €2.8bn.
In April QIHL reported a strong financial year for 2015, marking the first full 12-month reporting period since its acquisition of the Quinn Packaging and Construction Industry Supply ('CIS') businesses from Aventas.
Also last month, Mr Quinn issued a statement following what he described as "abusive" threats made against his former business interests in Cavan and Fermanagh, now controlled by QIHL.
Mr Quinn's statement was in response to incidents in which bullets were sent in the post to contractors working on his former windfarms and signs appearing on property owned by QIHL - his former manufacturing business.
