Cardiff: 15 Cam Winnett, 14 Josh Adams, 13 Harri Millard, 12 Ben Thomas, 11 Gabe Hamer-Webb, 10 Callum Sheedy, 9 Johan Mulder, 8 Taulupe Faletau, 7 Thomas Young, 6 James Botham, 5 Teddy Williams, 4 Josh McNally, 3 Keiron Assiratti, 2 Liam Belcher (captain), 1 Danny Southworth.
Replacements: 16 Evan Lloyd, 17 Corey Domachowski, 18 Rhys Litterick, 19 Rory Thornton, 20 Alun Lawrence,21 Ben Donnell, 22 Aled Davies, 23 Tinus de Beer
Munster: 15 Mike Haley, 14 Calvin Nash, 13 Tom Farrell, 12 Alex Nankivell,11 Thaakir Abrahams, 10 Jack Crowley, 9 Craig Casey, 8 Gavin Coombes, 7 Alex Kendellen, 6 Jack O’Donoghue, 5 Tadhg Beirne (captain), 4 Fineen Wycherley, 3 John Ryan, 2 Niall Scannell, 1 Michael Milne.
Replacements: 16 Diarmuid Barron, 17 Mark Donnelly, 18 Ronan Foxe, 19 Jean Kleyn, 20 Ruadhán Quinn, 21 Paddy Patterson, 22 Tony Butler, 23 Seán O’Brien.
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Glasgow Warriors: 15 Ollie Smith, 14 Sebastian Cancelliere, 13 Kyle Steyn (captain), 12 Stafford McDowall, 11 Kyle Rowe, 10 Tom Jordan, 9 George Horne,8 Jack Mann, 7 Rory Darge, 6 Gregor Brown, 5 Alex Samuel, 4 Max Williamson, 3 Patrick Schickerling, 2 Gregor Hiddleston, 1 Nathan McBeth.
Replacements: 16 Johnny Matthews, 17 Jamie Bhatti, 18 Sam Talakai, 19 Scott Cummings, 20 Euan Ferrie, 21 Sione Vailanu, 22 Jamie Dobie, 23 Adam Hastings
Bulls: 15 Devon Williams, 14 Canan Moodie, 13 David Kriel, 12 Harold Vorster, 11 Sebastian de Klerk, 10 Johan Goosen, 9 Embrose Papier, 8 Marco van Staden, 7 Ruan Nortje (captain), 6 Jannes Kirsten, 5 JF van Heerden, 4 Cobus Wiese, 3 Wilco Louw, 2 Johann Grobbelaar, 1 Jan-hendrik Wessels.
Replacements: 16 Akker van der Merwe, 17 Simphiwe Matanzima, 18 Mornay Smith, 19 Jacobus Grobler, 20 Marcell Coetzee, 21 Keagan Johannes, 22 Willie le Roux, 23 Stedman Gans.
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Zebre: 15 Jacopo Trulla, 14 Scott Gregory, 13 Fetuli Paea, 12 Damiano Mazza, 11 Simone Gesi, 10 Giacomo Da Re, 9 Alessandro Fusco, 8 Giovanni Licata, 7 Bautista Stavile, 6 Giacomo Ferrari, 5 Leonard Krumov, 4 Matteo Canali , 3 Muhamed Hasa, 2 Tommaso Di Bartolomeo, 1 Danilo Fischetti (captain).
Replacements: 16 Luca Bigi, 17 Paolo Buonfiglio, 18 Juan Pitinari, 19 Andrea Zambonin, 20 Rusiate Nasove, 21 Gonzalo Garcia, 22 Giovanni Montemauri, 23 Luca Morisi
Edinburgh: 15 Harry Paterson, 14 Darcy Graham, 13 Matt Currie, 12 James Lang, 11 Jack Brown, 10 Ross Thompson, 9 Ali Price, 8 Magnus Bradbury (captain), 7 Hamish Watson, 6 Ben Muncaster, 5 Sam Skinner, 4 Glen Young, 3 D’arcy Rae, 2 Paddy Harrison, 1 Boan Venter
Replacements: 16 Harri Morris, 17 Robin Hislop, 18 Angus Williams, 19 Grant Gilchrist, 20 Freddy Douglas, 21 Charlie Shiel, 22 Cammy Scott, 23 Mosese Tuipulotu.
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Lions: 15 Quan Horn, 14 Richard Kriel, 13 Henco van Wyk, 12 Bronson Mills, 11 Edwill van der Merwe, 10 Kade Wolhuter, 9 Morné van den Berg, 8 Jarod Cairns, 7 Renzo du Plessis, 6 JC Pretorius, 5 Ruan Delport, 4 Ruben Schoeman, 3 Asenathi Ntlabakanye, 2 Jaco Visagie (captain), 1 Morgan Naude.
Replacements: 16 PJ Botha, 17 SJ Kotze, 18 RF Schoeman, 19 Darrien Landsberg, 20 Izan Esterhuizen, 21 Nico Steyn, 22 Lubabalo Dobela, 23 Rynhardt Jonker.
Connacht: 15 Piers O’Conor, 14 Shayne Bolton, 13 David Hawkshaw, 12 Cathal Forde, 11 Shane Jennings, 10 Jack Carty, 9 Matthew Devine, 8 Sean Jansen, 7 Conor Oliver, 6 Cian Prendergast (captain), 5 Joe Joyce, 4 Josh Murphy, 3 Finlay Bealham, 2 Dave Heffernan, 1 Peter Dooley.
Replacements: 16 Eoin de Buitléar, 17 Jordan Duggan, 18 Sam Illo, 19 Oisín Dowling, 20 Paul Boyle, 21 Colm Reilly, 22 Hugh Gavin, 23 Santiago Cordero.
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Ospreys: 15 Jack Walsh, 14 Daniel Kasende, 13 Evardi Boshoff, 12 Keiran Williams, 11 Keelan Giles, 10 Dan Edwards, 9 Kieran Hardy, 8 Morgan Morse, 7 Jac Morgan (captain), 6 James Ratti, 5 Adam Beard, 4 Will Spencer, 3 Ben Warren, 2 Dewi Lake, 1 Gareth Thomas.
Replacements: 16 Sam Parry, 17 Steffan Thomas, 18 Tom Botha, 19 Will Griffiths, 20 Harri Deaves, 21 Reuben Morgan-Williams, 22 Owen Williams, 23 Iestyn Hopkins.
Dragons: 15 Ewan Rosser, 14 Harry Rees-Weldon, 13 Joe Westwood, 12 Aneurin Owen (captain), 11 Jared Rosser, 10 Angus O’Brien, 9 Rhodri Williams, 8 Aaron Wainwright, 7 Dan Lydiate, 6 Shane Lewis-Hughes, 5 Ryan Woodman, 4 Joe Davies, 3 Chris Coleman, 2 Brodie Coghlan, 1 Rhodri Jones.
Replacements: 16 Elliot Dee, 17 Dylan Kelleher-Griffiths, 18 Nathan Evans, 19 Barny Langton-Cryer, 20 George Young, 21 Che Hope, 22 Will Reed, 23 Huw Anderson.
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Stormers: 15 Warrick Gelant, 14 Seabelo Senatla, 13 Dan du Plessis, 12 Damian Willemse, 11 Leolin Zas, 10 Sacha Feinberg-Mngomezulu, 9 Stefan Ungerer, 8 Evan Roos, 7 Marcel Theunissen, 6 Paul de Villiers, 5 Ruben van Heerden, 4 Salmaan Moerat (captain), 3 Sazi Sandi, 2 André-Hugo Venter, 1 Ali Vermaak.
Replacements: 16 JJ Kotze, 17 Vernon Matongo, 18 Brok Harris, 19 JD Schickerling, 20 Connor Evans, 21 Louw Nel, 22 Herschel Jantjies, 23 Suleiman Hartzenberg.
Benetton: 15 Leonardo Marin, 14 Ignacio Mendy, 13 Tommaso Menoncello, 12 Ignacio Brex, 11 Paolo Odogwu, 10 Jacob Umaga, 9 Alessandro Garbisi, 8 Lorenzo Cannone, 7 Michele Lamaro (captain), 6 Riccardo Favretto, 5 Federico Ruzza, 4 Niccolò Cannone, 3 Simone Ferrari, 2 Bautista Bernasconi, 1 Thomas Gallo.
Replacements: 16 Siua Maile, 17 Ivan Nemer, 18 Giosué Zilocchi, 19 Scott Scrafton, 20 Eli Snyman, 21 Manuel Zuliani, 22 Andy Uren, 23 Rhyno Smith.
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Scarlets: 15 Blair Murray, 14 Tom Rogers, 13 Joe Roberts, 12 Johnny Williams, 11 Ellis Mee, 10 Sam Costelow, 9 Gareth Davies, 8 Taine Plumtree, 7 Josh Macleod (captain), 6 Vaea Fifita, 5 Sam Lousi, 4 Alex Craig, 3 Henry Thomas, 2 Ryan Elias, 1 Alec Hepburn
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Replacements: 16 Marnus van der Merwe, 17 Louie Trevett, 18 Sam Wainwright, 19 Jac Price, 20 Jarrod Taylor, 21 Archie Hughes, 22 Ioan Lloyd, 23 Macs Page.
Leinster: 15 Ciarán Frawley, 14 Andrew Osborne, 13 Liam Turner, 12 Jamie Osborne, 11 Jimmy O’Brien, 10 Ross Byrne, 9 Fintan Gunne, 8 James Culhane, 7 Will Connors, 6 Alex Soroka, 5 Brian Deeny, 4 Ryan Baird, 3 Thomas Clarkson, 2 Rónan Kelleher (captain), 1 Cian Healy
Replacements: 16 Gus McCarthy, 17 Jack Boyle, 18 Rabah Slimani, 19 Diarmuid Mangan, 20 Scott Penny, 21 Cormac Foley, 22 Charlie Tector, 23 Ruben Moloney.
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Ulster: 15 Jacob Stockdale, 14 Werner Kok, 13 Jude Postlethwaite, 12 Stuart McCloskey, 11 Zac Ward, 10 Jack Murphy, 9 Nathan Doak, 8 James McNabney, 7 Nick Timoney, 6 Matty Rea, 5 Cormac Izuchukwu, 4 Alan O’Connor (captain), 3 Tom O’Toole, 2 Rob Herring, 1 Andrew Warwick
Replacements: 16 Tom Stewart, 17 Callum Reid, 18 Scott Wilson, 19 Matthew Dalton, 20 Kieran Treadwell, 21 Dave Shanahan, 22 Aidan Morgan, 23 David McCann.
Sharks: 15 Aphelele Fassi, 14 Ethan Hooker, 13 Lukhanyo Am, 12 Andre Esterhuizen, 11 Makazole Mapimpi, 10 Jordan Hendrikse, 9 Jaden Hendrikse, 8 Siya Kolisi, 7 Vincent Tshituka, 6 James Venter, 5 Jason Jenkins, 4 Eben Etzebeth (captain), 3 Vincent Koch, 2 Bongi Mbonambi, 1 Ox Nche.
Replacements: 16 Fez Mbatha, 17 Ntuthuko Mchunu, 18 Hanro Jacobs, 19 Manu Tshituka, 20 Phepsi Buthelezi, 21 Bradley Davids, 22 Siya Masuku, 23 Jurenzo Julius.