The Millennium Stadium is already a familiar venue for Blues supporters with the fans breaking the Celtic League record attendance when 15,327 turned up to watch them beat Leinster in 2006. This season a Welsh Heineken Cup record was set when over 26,000 fans watched the Blues take on European giants Leicester in October.
The EDF Energy semi-finals will be the first event in which two Welsh regions will face each other at the home of Welsh rugby and the rivalry between both sets of fans is sure to generate a great atmosphere.
The Blues have really been pushing ticket sales with their mascot, Bruiser the Bear, handing out flyers during Saturday's Wales v England clash. They will also have a stand in St David's Hall next Thursday and Friday when first team players will be helping Blues staff sell tickets for the big match.
David Young, Cardiff Blues Head Coach said: "We have enjoyed tremendous support from the fans already this season and the players were blown away at the numbers that turned up to watch us play Leicester at the Millennium Stadium. The noise generated by them that day was amazing although the result didn't go our way."
"It's great news that they are showing their loyalty again for this match and we are desperate to reward them for sticking with us through the lean years. We want the fans to be a part of the day and hopefully they will have something to shout about when the final whistle is blown."
The Blues averaged crowds of 8,741 for their wins over London Wasps and London Irish in the pool stages, the highest of all the Welsh regions and a crowd of 50,000 is expected to watch the giants of Welsh and English rugby face each other for a place in the final which will be played at Twickenham on Saturday April 14th.