Italians added to Magners League set-up
The Welsh, Irish and Scottish unions have agreed unanimously that Benetton Treviso and Aironi Rugby should join the competition as part of a four-year agreement.
The decision ends a year-long study into the viability of expanding the competition.
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Hide AdDavid Jordan, director of Celtic Rugby, said: "This is another massive step forward for the Magners League.
"As well as providing more fixtures for the teams already involved this will also bring both a major cash injection into the competition and greater exposure across Europe."