Cardiff Blues and Wales centre Jamie Roberts out for six months Cardiff Blues centre Jamie Roberts will miss the rest of the season and Wales' summer tour to Australia after it was decided that he needs to undergo knee surgery. Roberts originally picked up a knee problem in the Heineken Cup win over Racing Metro in November and suffered another injury to the same knee in Friday's 31-3 defeat against Glasgow and needs surgery on his anterior cruciate ligament. He will miss this weekend's daunting Heineken Cup quarter-final against Leinster, with Dafydd Hewitt or Gavin Evans set to deputise. Gavin Henson would have been a potential replacement but he was sacked by the Blues yesterday for his alcohol-fuelled behaviour on the flight back from Glasgow A Blues statement read: "Cardiff Blues can confirm that Blues and Wales centre Jamie Roberts will require surgery on his knee and will miss the rest of the season."