Cardiff Blues are forced into a late change ahead of Judgement Day at the Millennium Stadium as former Scarlet Gavin Evans misses the game against his former region.
Evans is ruled out following a fitness test and his place is taken by winger Harry Robinson.
Matthew Rees will make his first start for Cardiff Blues since returning to action when they tackle his former region in the RaboDirect PRO12 (kick-off 2pm).
Centre Dafydd Hewitt is also called up after his late try bonus heroics against Edinburgh.
Lock Bradley Davies will also make his first start of the calendar year after successfully coming on as a replacement in the victory in Scotland.
Wing Chris Czekaj will hit another memorable milestone in his career as he plays his 100th game in the RaboDirect PRO12.
Cardiff Blues: 15 Dan Fish, 14 Alex Cuthbert, 13 Cory Allen, 12 Dafydd Hewitt, 11 Chris Czekaj, 10 Gareth Davies, 9 Lewis Jones; 1 Gethin Jenkins (c), 2 Matthew Rees, 3 Taufa’ao Filise, 4 Bradley Davies, 5 Filo Paulo, 6 Macauley Cook, 7 Josh Navidi, 8 Robin Copeland
Replacements: 16 Rhys Williams, 17 Thomas Davies, 18 Scott Andrews, 19 Chris Dicomidis, 20 Ellis Jenkins, 21 Lloyd Williams, 22 Simon Humberstone, 23 Harry Robinson