The Millennium Stadium could host both of the 2008/09 Heineken Cup semi-finals - if Cardiff Blues and the Ospreys qualify for the last four.
Following the semi-final draw, which took place in Edinburgh in January, the winners of the games between Cardiff Blues and Toulouse and Munster and the Ospreys will have "home country" advantage in the semi-finals.
ERC, the tournament organisers, have selected three potential semi-final venues for the matches to be played on the weekend of 2 / 3 May.
And if the Blues beat Toulouse at the Millennium Stadium in the opening Heineken Cup quarter-final tomorrow (Saturday) and the Ospreys knock-out Munster at Thomond Park on Sunday, then the Millennium Stadium will host both semi-finals on successive days placing Cardiff at the centre of European rugby.
Croke Park has already been announced as the arena if Munster qualify to play either Harlequins or Leinster with the Municipal Stadium in Toulouse on standby if the triple Heineken Cup winners go through to face English opposition in the shape of either Leicester Tigers or Bath Rugby.
Tickets for the Heineken Cup semi-finals will go on sale on Sunday, 12 April.
The directors of ERC voted unanimously at a Board meeting to postpone all decisions including the release of further instalments of ERC's distributable central revenues to the six shareholder countries until 19 February next when the Board will meet again to reconsider the issue.