Rory Best and Ruan Pienaar are back in the Ulster team to face Leinster in the Pro12 semi-final at the RDS after recovering from injury.

They are among 13 changes to the team which beat Munster last week, with only Craig Gilroy and Callum Black retaining their places.

Leinster make eight changes, all but one in the pack with skipper Jamie Heaslip staying at number eight.

Eoin Reddan comes in for former Ulster scrum-half Issac Boss.

Leinster: R Kearney, F McFadden, B O'Driscoll, G D'Arcy, D Kearney, J Gopperth, E Reddan, C Healy, S Cronin, M Moore, D Toner, Q Roux, R Ruddock, S Jennings, J Heaslip (capt).

Replacements: A Dundon, J McGrath, M Ross, L Cullen, S O'Brien, I Boss, I Madigan, Z Kirchner.

Ulster: C Gilroy, T Bowe, J Payne, D Cave, A Trimble, P Jackson, R Pienaar, C Black, R Best, R Lutton, J Muller (capt), I Henderson, R Diack, C Henry, R Wilson.

Replacements: R Herring, A Warwick, A Macklin, D Tuohy, S Doyle, P Marshall, J McKinney, L Marshall.