Turnbull's place on the bench has been taken by scrum-half Sililo Martens with Stephen Jones taking over the captaincy.
Harlequins have made a couple of changes with All Blacks flyhalf Nicky Evans switching from fly half to full back to give Chris Malone a starting berth at No 10.
Harlequins: N. Evans; T. Williams, G. Tiesi, J. Turner-Hall, U. Monye; C. Malone, D. Care; C. Jones, T. Fuga, M. Ross, J. Percival, G. Robson, C. Robshaw, N. Easter, W. Skinner (capt). Reps: C. Brooker, M. Lambert, J. Evans, T. Guest, J. Poluleuligaga, C. Amesbury, D. wet Barry






