Justin Tipuric appears for the Ospreys for the first time this season as they face Cardiff Blues at Swansea's Liberty Stadium tonight.
Another of Wales’ World Cup stars, Josh Adams, makes his Guinness PRO14 bow for the Blues in the derby clash.
Ospreys are bottom of Conference A with just one victory in seven attempts while the Blues, who have won three times, have only Southern Kings below them in Conference B.
Follow live updates below. Kick-off: 7.35pm.
Ospreys: C Evans; H Dirksen, T Thomas-Wheeler, S Williams, L Morgan; M McKenzie, A Davies; N Smith, S Otten, M Fia, A Beard, B Davies, D Lydiate, J Tipuric (capt), O Cracknell.
Subs: D Lake, R Fawcett, S Gardiner, M Orie, M Morris, S Venter, L Price, K Williams.
Blues: M Morgan; O Lane, R Lee-Lo, B Thomas, J Adams; J Evans, T Williams; B Thyer, K Myhill, S Andrews, F Paulo, J Ratti, S Lewis-Hughes, W Boyde (capt), J Turnbull.
Subs: L Belcher, R Gill, K Assiratti, M Cook, O Robinson, L Williams, J Tovey, H Amos.
Referee: Dan Jones (Wales).