Manager Barry McGuigan said: "Carl Frampton has represented both the Commowealth Boxing Council and the European Boxing Union extremely well in his time as champion, of which we are sure both Simon Block of the CBC and Enza Jacaponi of the EBU will attest to.
"In relinquishing these titles Carl will afford a fantastic opportunity for four aspiring boxers to contest for these two vacant and highly valuable championships."
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