ALUN Wyn Jones and Dan Biggar start for the Ospreys against the Blues in Swansea on Friday evening (7.05pm), just six days after featuring in Wales’s Six Nations encounter with Scotland.
Justin Tipuric, who figured off the bench against the Scots, is also named in Steve Tandy’s team, along with a fit-again Rhys Webb.
Webb will return to the side 12 days after injuring an ankle against England at Twickenham.
A slight shoulder injury means Richard Hibbard sits out the derby, with Scott Baldwin starting and Scott Otten featuring on the bench.
Adam Jones and James King are also among the replacements as the Ospreys chase the points they need to stay in contention for a place in the Pro12 playoffs.
Starting life after Phil Davies, the Blues name Wales pair Gethin Jenkins and Alex Cuthbert in their side, with Cory Allen returning in midfield for his first outing since damaging a shoulder while on Wales duty in the autumn.
Ospreys: S. Davies; J Hassler, J Spratt, A. Beck, A. Natoga; D. Biggar, R. Webb; D. Jones, S. Baldwin, A. Jarvis, R Jones, A. W. Jones (capt), S. Lewis, D. Baker, S. Lewis. Reps: S. Otten, M. Thomas, A. Jones, J. King, J. Bearman, M. Allen, T. Habberfield, H. Dirksen.
Blues: D. Fish; A. Cuthbert, C. Allen, G. Evans, H. Robinson; G. Davies, L. Williams; G Jenkins (capt), R. Williams, T. Filise, C. Dicomidis, F. Paulo, E. Jenkins, R. Copeland, J. Navidi. Reps: K. Dacey, S. Hobbs, S. Andrews, L. Rees, M. Cook, L. Jones, S. Humberstone, I. Tuifua.