Leinster head coach Cullen has made a number of changes from the team that played last weekend against Glasgow Warriors with captain Johnny Sexton back from injury having recovered from a quad injury.
Elsewhere in the backs Rob Kearney again starts at full back, Jordan Larmour is again on the right wing but James Lowe comes in on the left.
In the centre Robbie Henshaw is again selected but is joined this week by Garry Ringrose.
In the half backs it’s a new pair selected by Cullen this week, with the aforementioned Sexton, back from injury, partnered by Luke McGrath.
— Leinster Rugby (@leinsterrugby) April 19, 2019
In the pack Cian Healy, Seán Cronin and Tadhg Furlong, who all came on at half time last week, start with Devin Toner and James Ryan behind them in the second row.
There are two changes in the back row with Rhys Ruddock selected at blindside with Seán O’Brien retaining his place at openside and finally Jack Conan comes in at number eight.
Toulouse meanwhile have picked France scrum half Antoine Dupont at fly-half, with Sébastien Bézy inside him. Romain Ntamack isn’t in the 23-man squad.
? 1/2 finale de @ChampionsCup_FR pour les Stadistes !
Découvrez sans tarder le XV de départ désigné par le staff toulousain pour affronter l'équipe du @leinsterrugby, dimanche à 16h15 (HF) à l'Aviva Stadium de Dublin ! #LEINST
Tous derrière les Rouge et Noir ! #GoST ??? pic.twitter.com/sEbvMiotOt
— Stade Toulousain (@StadeToulousain) April 19, 2019
In the pack Toulouse have the likes of Scotland lock Richie Gray, along with former All Blacks Charlie Faumuina and Jerome Kaino.
Leinster team to play Toulouse:
15. Rob Kearney, 14. Jordan Larmour, 13. Garry Ringrose, 12. Robbie Henshaw, 11. James Lowe, 10. Johnny Sexton (c), 9. Luke McGrath, 1. Cian Healy, 2. Sean Cronin, 3. Tadhg Furlong, 4. Devin Toner, 5. James Ryan, 6. Rhys Ruddock, 7. Sean O’Brien, 8. Jack Conan.
16. James Tracy, 17. Ed Byrne, 18. Michael Bent, 19. Scott Fardy, 20. Max Deegan, 21. Hugh O’Sullivan, 22. Ross Byrne, 23. Rory O’Loughlin,
Toulouse team to play Leinster:
15. Thomas Ramos, 14. Yoann Huget, 13. Sofiane Guitoune, 12. Pita Ahki, 11. Cheslin Kolbe, 10. Antoine Dupont, 9. Sébastien Bézy, 1. Clément Castets, 2. Peato Mauvaka, 3. Charlie Faumuina, 4. Richie Arnold, 5. Richie Gray, 6. Rynhardt Elstadt, 7. Joe Tekori, 8. Jerome Kaino (c).
16. Guillaume Marchand, 17. Cyril Baille, 18. Maks Van Dyk, 19. Selevasio Tolofua, 20. Piula Faasalele, 21. Francois Cros, 22. Romain Ntamack, 23. Maxime Médard,
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