Pro12: Ruan Pienaar an injury doubt for Ulster's Pro12 game against Leinster

Ospreys' Rhys Webb grapples with Ulster scrum-half Ruan Pienaar
Ruan Pienaar (right) lasted only 20 minutes of Saturday's defeat by the Ospreys
Pro12: Ulster v Leinster
Date: Saturday, 6 May Venue: Kingspan Stadium Kick-off: 17:15 BST
Coverage: Live on BBC Two Northern Ireland and the BBC Sport website. Highlights later on the BBC Sport website

Ruan Pienaar may have played his final Pro12 game for Ulster as a back spasm means he is a doubt for Saturday's contest with Leinster.

Pienaar, who is leaving Ulster at the end of this season, sustained the injury in the warm-up before Saturday's defeat by the Ospreys.

The South African, 33, started Saturday's contest but was forced off after 20 minutes.

Ulster's hopes of reaching the play-offs semi-finals now look remote.

Les Kiss' side are now five points behind fourth-placed Ospreys and only a huge bonus-point victory over the leaders this weekend - allied to a heavy Ospreys defeat - would see Ulster sneaking into the semi-finals.

Pienaar will round off his Ulster playing career in the game the Barbarians at Kingspan Stadium on 1 June.

Stuart Olding will miss the Leinster game after picking up a leg injury in Saturday's defeat while Charles Piutau also picked up a knock in the weekend game.

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