Scarlets: 15 Ioan Nicholas; 14 Tom Rogers, 13 Johnny Williams, 12 Eddie James, 11 Blair Murray; 10 Sam Costelow, 9 Gareth Davies; 8 Taine Plumtree, 7 Dan Davis, 6 Josh Macleod (captain), 5 Max Douglas, 4 Sam Lousi,3 Henry Thomas, 2 Ryan Elias, 1 Alec Hepburn
Replacements: 16 Marnus van der Merwe, 17 Kemsley Mathias, 18 Sam Wainwright, 19 Alex Craig, 20 Carwyn Tuipulotu, 21 Efan Jones, 22 Ioan Lloyd, 23 Macs Page
Connacht: 15 Santiago Cordero, 14 Mack Hansen, 13 Cathal Forde, 12 Bundee Aki, 11 Piers O’Conor, 10 Jack Carty, 9 Ben Murphy, 8 Cian Prendergast (captain), 7 Conor Oliver, 6 Josh Murphy, 5 David O’Connor, 4 Niall Murray, 3 Finlay Bealham, 2 Dave Heffernan, 1 Denis Buckley
Replacements: 16 Dylan Tierney-Martin, 17 Peter Dooley,18 Temi Lasisi, 19 Oisín Dowling, 20 Paul Boyle, 21 Caolin Blade, 22 David Hawkshaw, 23 Shayne Bolton
Cardiff: 15 Cam Winnett, 14 Mason Grady, 13 Rey Lee-Lo, 12 Ben Thomas, 11 Harri Millard, 10 Callum Sheedy, 9 Aled Davies, 8 Alun Lawrence, 7 Dan Thomas, 6 Ben Donnell, 5 Teddy Williams, 4 Josh McNally, 3 Keiron Assiratti, 2 Liam Belcher (capt), 1 Corey Domachowski
Replacements: 16 Evan Lloyd, 17 Ed Byrne, 18 Rhys Litterick, 19 Rory Thornton, 20 Mackenzie Martin, 21 Ellis Bevan, 22 Tinus de Beer, 23 Gabriel Hamer-Webb.
Glasgow Warriors: 15 Josh McKay, 14 Kyle Rowe, 13 Huw Jones, 12 Sione Tuiplulotu (captain), 11 Facundo Cordero, 10 Tom Jordan, 9 Jamie Dobie, 8 Jack Dempsey, 7 Matt Fagerson, 6 Gregor Brown, 4 Alex Samuel, 3 Sam Talakai, 2 Johnny Matthews, 1 Rory Sutherland
Replacements: 16 Gregor Hiddleston, 17 Jamie Bhatti, 18 Patrick Schickerling, 19 Richie Gray, 20 Max Williamson, 21 Euan Ferrie,22 Ben Afshar, 23 Duncan Weir
Lions: 15 Quan Horn, 14 Rabz Maxwane, 13 Erich Cronje, 12 Rynhardt Jonker, 11 Edwill van der Merwe, 10 Kade Wolhuter, 9 Morne van den Berg, 8 Francke Horn (captain), 7 Jarod Cairns, 6 Johannes Pretorius, 5 Darrien Landsberg, 4 Reinhard Nothnagel, 3 Asenathi Ntlabakanye, 2 Pieter Botha, 1 Juan Schoeman\
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Replacements: 16 Franco Marais, 17 Heiko Pohlmann, 18 Conraad van Vuuren, 19 Ruben Schoeman, 20 Renzo du Plessis, 21 Sanele Nohamba, 22 Marius Louw, 23 Henco van Wyk.
Edinburgh: 15 Wes Goosen, 14 Darcy Graham, 13 Ross McCann, 12 Matt Scott, 11 Duhan van der Merwe, 10 Ben Healy, 9 Ben Vellacott (co-captain), 8 Magnus Bradbury, 7 Hamish Watson, 6 Jamie Ritchie, 5 Grant Gilchrist (co-captain), 4 Marshall Sykes, 3 Paul Hill, 2 Ewan Ashman, 1 Pierre Schoeman.
Replacements: 16 Patrick Harrison, 17 Boan Venter, 18 D’Arcy Rae, 19 Jamie H
Bulls: 15 Willie le Roux, 14 Sebastian de Klerk, 13 Canan Moodie, 12 David Kriel, 11 Kurt-Lee Arendse, 10 Boeta Chamberlain, 9 Embrose Papier, 8 Cameron Hanekom, 7 Elrigh Louw (captain), 6 Marco van Staden, 5 Ruan Nortje (captain), 4 Cobus Wiese, 3 Wilco Louw, 2 Johan Grobbelaar, 1 Gerhard Steenekamp
Replacements: 16 Akker van der Merwe, 17 Jan-Hendrik Wessels, 18 Francois Klopper, 19 Sintu Manjezi, 20 Mpilo Gumede, 21 Keagan Johannes, 22 Stedman Gans, 23 Aphiwe Dyantyi
Ulster: 15 Mike Lowry, 14 Werner Kok, 13 Stewart Moore, 12 Ben Carson, 11 Jacob Stockdale, 10 Aidan Morgan, 9 Nathan Doak, 8 David McCann, 7 Sean Reffell, 6 James McNabney, 5 Charlie Irvine, 4 Iain Henderson (captain), 3 Corrie Barrett, 2 James McCormick, 1 Andrew Warwick.
Replacements: 16 Tadgh McElroy, 17 Eric O’Sullivan, 18 Tom O’Toole, 19 Alan O’Connor, 20 Nick Timoney, 21 Dave Shanahan, 22 James Humphreys, 23 Ben Moxham.
Dragons: 15 Angus O’Brien, 14 Rio Dyer, 13 Harry Wilson, 12 Aneurin Owen, 11 Jared Rosser, 10 Lloyd Evans, 9 Rhodri Williams, 8 Dan Lydiate, 7 Taine Basham, 6 Shane Lewis-Hughes, 5 Matthew Screech, 4 Ben Carter (captain), 3 Leon Brown, 2 Brodie Coghlan, 1 Rhodri Jones
Replacements: 16 Oli Burrows, 17 Rodrigo Martinez, 18 Chris Coleman, 19 Joe Davies, 20 Ryan Woodman, 21 Dane Blacker, 22 Will Reed, 23 Joe Westwood.
Sharks: 15 Jordan Hendrikse, 14 Eduan Keyter, 13 Jurenzo Julius, 12 Andre Esterhuizen, 11 Ethan Hooker, 10 Siya Masuku, 9 Jaden Hendrikse, 8 Emmanuel Tshituka, 7 Vincent Tshituka (captain), 6 James Venter, 5 Gerbrandt Grobler, 4 Jason Jenkins, 3 Ruan Dreyer, 2 Dylan Richardson, 1 Ntuthuko Mchunu
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Replacements: 16 Fez Mbatha, 17 Trevor Nyakane, 18 Hanro Jacobs, 19 Corne Rahl, 20 Phepsi Buthelezi, 21 Cameron Wright, 22 Lionel Cronje, 23 Francois Venter.
Benetton: 15 Matt Gallagher, 14 Ignacio Mendy, 13 Tommaso Menoncello, 12 Malakai Fekitoa, 11 Paolo Odogwu, 10 Jacob Umaga, 9 Alessandro Garbisi, 8 Michele Lamaro (captain), 7 Manuel Zuliani, 6 Sebastian Negri, 5 Riccardo Favretto, 4 Niccolò Cannone, 3 Simone Ferrari, 2 Siua Maile, 1 Mirco Spagnolo.
Replacements: 16 Marco Manfredi, 17 Destiny Aminu, 18 Enzo Avaca, 19 Federico Ruzza, 20 Giulio Marini, 21 Lorenzo Cannone, 22 Andy Uren, 23 Leonardo Marin.
Leinster: 15 Hugo Keenan, 14 Jimmy O’Brien, 13 Garry Ringrose, 12 Jamie Osborne, 11 James Lowe, 10 Ciarán Frawley, 9 Jamison Gibson-Park, 8 Caelan Doris (captain), 7 Josh van der Flier, 6 Jack Conan, 5 RG Snyman, 4 Joe McCarthy, 3 Tadhg Furlong, 2 Rónan Kelleher, 1 Andrew Porter.
Replacements: 16 Lee Barron, 17 Michael Milne, 18 Thomas Clarkson, 19 Ryan Baird, 20 Brian Deeny, 21 Fintan Gunne, 22 Ross Byrne, 23 Scott Penny
Zebre: 15 Geronimo Prisciantelli, 14 Jacopo Trulla, 13 Luca Morisi, 12 Fetuli Paea, 11 Simone Gesi, 10 Giacomo Da Re, 9 Alessandro Fusco, 8 Giacomo Ferrari, 7 Samuele Locatelli, 6 Davide Ruggeri, 5 Leonard Krumov, 4 Matteo Canali, 3 Matteo Nocera, 2 Tommaso Di Bartolomeo, 1 Danilo Fischetti (captain).
Replacements: 16 Luca Bigi, 17 Luca Rizzoli, 18 Juan Pitinari, 19 Andrea Zambonin, 20 Giovanni Licata, 21 Gonzalo Garcia, 22 Scott Gregory, 23 Giovanni Montemauri.
Stormers: 15 Damian Willemse, 14 Suleiman Hartzenberg, 13 Ruhan Nel, 12 Dan du Plessis (captain), 11 Leolin Zas, 10 Jurie Matthee, 9 Paul de Wet, 8 Keke Morabe, 7 Ben-Jason Dixon, 6 Marcel Theunissen, 5 Ruben van Heerden, 4 JD Schickerling, 3 Neethling Fouche, 2 Joseph Dweba, 1 Sti Sithole.
Munster: 15 Mike Haley, 14 Calvin Nash, 13 Tom Farrell, 12 Bryan Fitzgerald, 11 Shay McCarthy, 10 Jack Crowley, 9 Craig Casey, 8 Jack O’Donoghue, 7 John Hodnett, 6 Peter O’Mahony, 5 Tadhg Beirne (captain), 4 Jean Kleyn, 3 Oli Jager, 2 Niall Scannell, 1 Jeremy Loughman.
Replacements: 16 Diarmuid Barron, 17 John Ryan, 18 Stephen Archer, 19 Fineen Wycherley, 20 Gavin Coombes, 21 Conor Murray, 22 Tony Butler, 23 Jack Daly.
Ospreys: 15 Max Nagy, 14 Iestyn Hopkins, 13 Owen Watkin, 12 Phil Cokanasiga, 11 Ryan Conbeer, 10 Dan Edwards, 9 Reuben Morgan-Williams, 8 Morgan Morris, 7 Jac Morgan (captain), 6 James Ratti, 5 Adam Beard, 4 Huw Sutton, 3 Tom Botha, 2 Dewi Lake, 1 Steffan Thomas.
Replacements: 16 Sam Parry, 17 Garyn Phillips, 18 Ben Warren, 19 Lewis Jones, 20 Harri Deaves, 21 Luke Davies, 22 Jack Walsh, 23 Keiran Williams.