The 22-year-old giant centre has been struggling with injury this season but with Wales' RBS 6 Nations opener against England at Twickenham on February 6 - Roberts admitted his delight at sorting his long-term future.

"I'm fortunate that I've tasted some success early in my career but I remain as focused as ever to play my part in a successful Cardiff Blues team," said Roberts, who made his debut for the Blues in 2007.

"Last season's achievements and disappointments have driven me and the whole squad to work harder and strive for bigger and better things.

"The new contract fits in perfectly with my part-time academic studies at the [Cardiff] School Of Medicine where I will hopefully graduate in 2013 if all goes to plan."

Meanwhile, Wales international prop John Yapp has also followed in the footsteps of Roberts and penned a new deal with Cardiff until 2013.

The versatile prop, who can play on both sides of the scrum, is currently returning to full fitness following a bicep injury.

"I've have great support from the Blues throughout my injury and it's a real boost to be offered a new contract when I've been out so long," said Yapp.