Sexton partners Chris Whitaker at half-back, with O'Brien coming into a strong pack which includes Ireland internationals Bernard Jackman, Leo Cullen, Malcolm O'Kelly, Shane Jennings and Jamie Heaslip.
Over 12,500 tickets have now been sold for Friday's Magners League clash against the Scarlets. Tickets are still on sale on www.leinsterrugby.ie along with Ticketmaster outlets nationwide. Tickets are also on sale in the Leinster Rugby Store and Spar shop in Donnybrook. Friday will feature a 'Family Day' action on the sand arena (beside the Leinster Supporters Bar) up until kick off, which will include the Canterbury Roadshow where young players can test their skills, face painting from the FM104 Bugs, and Leo the Lion.
The end of season post match reception will kick off in the Serpentine Hall with live music from All Star Charge (featured at Ladies Night) and there will also be player appearances. It will be the last chance to wish the team well for the last two matches, including the Heineken Cup Final, as well as being a chance to wish Leinster's British & Irish Lions all the best ahead of their tour to South Africa. A presentation will also be made to the departing Felipe Contepomi by the Official Leinster Supporters Club.
LEINSTER:
15: Isa Nacewa
14: Shane Horgan
13: Brian O'Driscoll
12: Gordon D'Arcy
11: Luke Fitzgerald
10: Jonathan Sexton
9: Chris Whitaker
1: Cian Healy
2: Bernard Jackman
3: Stan Wright
4: Leo Cullen CAPTAIN
5: Malcolm O'Kelly
6: Sean O'Brien
7: Shane Jennings
8: Jamie Heaslip
REPLACEMENTS:
16: John Fogarty
17: Ronan McCormack
18: Devin Toner
19: Stephen Keogh
20: Simon Keogh
21: Fergus McFadden
22: Girvan Dempsey
REFEREE: Neil Paterson (SRU), ASSISTANT REFEREES: David Wilkinson (IRFU), Jonathan Peake (IRFU), 4th OFFICIAL: Kevin Beggs (ARLB) 5th OFFICIAL: Sean Gallagher (ARLB) TMO: John Carvill (IRFU)