Rabo Pro12 team news:Johann Muller will make his first start since December when Ulster take on the Ospreys tomorrow night. The Ulster captain, who signed a one year contract extension earlier this week, returns to lead the side having recovered from a hand injury.

Ireland internationals Andrew Trimble, Paddy Wallace and Tom Court - who are not involved in this weekend’s Six Nations match against England - will all start while Dan Tuohy and Darren Cave have been named on the bench.

Stuart Olding, who featured for Ireland’s Under-20s against Wales last weekend, will make his first start for the province at outhalf.

Leinster will have Isaac Boss at the base of their scrum for their match against the Cardiff Blues. Leo Cullen leads a team which shows a blend of youth and experience for the trip to the Welsh capital. Dominic Ryan makes just his third appearance after an injury interrupted season and he completes an exciting back-row alongside Shane Jennings and Jordi Murphy.

And Eric Elwood will have Kyle Tonetti back in harness for the first time this season with the Lansdowne centre selected in the Connacht midfield for their match against the Scarlets.

The half back pairing of Dan Parks and Kieran Marmion with Marmion keeping his record as the only player to have started every game this season.

Connacht(v Scarlets, Friday 7.30pm): T O'Halloran; D Poolman, E Griffin, K Tonetti, F Vainikolo; D Parks, K Marmion; B Wilkinson, J Harris-Wright, N White; M Swift, M Kearney; A Browne, J O'Connor, E McKeon. Replacements:E Reynecke, R Ah You, R Loughney, W Faloon, J Muldoon, P O'Donohoe, M Nikora, G Duffy

Leinster(v Cardiff, Friday 7.30pm): D Kearney; A Conway, B Macken, A Goodman, D Hudson; I Madigan, I Boss; J McGrath, A Dundon, M Bent; L Cullen, T Denton; D Ryan, S Jennings, J Murphy. Replacements:T Sexton, H van der Merwe, J Hagan, B Marshall, R Ruddock, J Cooney, N Reid, F Carr.

Ulster(v Ospreys, Friday 7.05pm): R Andrew, A Trimble, L Marshall, P Wallace, M Allen; S Olding, R Pienaar; C Black, R Herring, T Court; J Muller, L Stevenson; M McComish, A Birch, R Diack. Replacements:N Annett, R Lutton, A Warwick, D Tuohy, N McComb, P Marshall, D Cave, C Cochrane.