"Our focus switches to the Magners League now and it is important we bounce back in that competition," said 2009 Lions Man of the Series, Roberts.
"It's a huge period for the Welsh rugby teams and the fans watching us go head-to-head over the Christmas period.
"We have to come out all guns blazing, starting with the trip to Rodney Parade."
It is a crucial period in the Magners League with crunch local derbies in a busy festive period. First up for the third-placed Blues is the trip to Rodney Parade to take on Newport Gwent Dragons on December 27, before welcoming the Ospreys to the Cardiff City Stadium for a New Years Eve showdown.