Blues welcome back Halfpenny, Roberts and Davies

In the backs Leigh Halfpenny has recovered from a dead leg and starts at full back in place of Chris Czekaj who doesn't make the 23. Jamie Roberts also makes his first start since returning from international duty and takes his place at inside centre, Daf Hewitt moving to the bench. There is also a change at outside half with Ceri Sweeny starting instead of former Glasgow fly half Dan Parks who also doesn't make the 23.

In the forwards the Blues welcome back Bradley Davies at lock, who starts his first match since his seven week suspension. There is one more change in the backrow with Maama Molitika starting at blindside in place of Michael Paterson who is out with a neck/shoulder injury.

The Blues travel to Scotland on Friday to face a Glasgow Warriors side that have lost only one of their last 14 RaboDirect PRO12 encounters: 14-16 at Scarlets on 7 January - a run which has included four drawn matches.

However, the Blues have a good record at Firhill having won on their last two visits. The Warriors meanwhile will be going for a first ever season's double over the Blues, after the Blues suffered a 13-34 loss at home in round five which ended a six game winning run against opponents from Scotland.

Cardiff Blues 15. Leigh Halfpenny 14. Alex Cuthbert 13. Casey Laulala 12. Jamie Roberts 11. Tom James 10. Ceri Sweeney 9. Lloyd Williams

8. Xavier Rush (C) 7. Josh Navidi 6. Mamma Moitika 5. James Down 4. Bradley Davies 3. Scott Andrews 2. Ryan Tyrrell 1. John Yapp

16. Marc Breeze 17. Nathan Trevett 18. Sam Hobbs 19. Macauley Cook 20. Kristian Dacey 21. Richie Rees 22. Gavin Henson 23. Dafydd Hewitt
Players unavailable for selection
Michael Paterson - neck/shoulder
Gethin Jenkins - shoulder.
Sam Warburton - shoulder
T Rhys Thomas - neck
Martyn Williams - ribs
Paul Tito - head
Richard Mustoe - hip
Fau Filise - shoulder
Andries Pretorius - knee
Deiniol Jones - shoulders