Welsh involvement:
Connacht: Mack Hansen; Shayne Bolton, Hugh Gavin, Bundee Aki, Finn Treacy; JJ Hanrahan, Matthew Devine; Jordan Duggan, Dave Heffernan (capt), Finlay Bealham, OisĂn Dowling, Darragh Murray, Josh Murphy, Shamus Hurley-Langton, Sean Jansen.
Replacements: Dylan Tierney-Martin, Denis Buckley, Jack Aungier, Niall Murray, Paul Boyle, Caolin Blade, Josh Ioane, Piers O'Conor.
Cardiff: Cameron Winnett; Josh Adams, Rey Lee-Lo, Ben Thomas, Harri Millard; Callum Sheedy, Johan Mulder; Danny Southworth, Liam Belcher (capt), Keiron Assiratti, Josh McNally, Teddy Williams, Alun Lawrence, James Botham, Taulupe Faletau.
Replacements: Evan Lloyd, Corey Domachowski, Rhys Litterick, Rory Thornton, Alex Mann, Thomas Young, Ellis Bevan, Rory Jennings
Referee: Luc Ramos (FFR)
Assistant referees: Jeremy Rozier & Flavien Hourquet (FFR)
TMO: Eric Gauzins (FFR).
Ospreys: Jack Walsh; Dan Kasende, Evardi Boshoff, Keiran Williams, Keelan Giles; Dan Edwards, Reuben Morgan-Williams; Gareth Thomas, Dewi Lake, Tom Botha, Rhys Davies, Adam Beard, Jac Morgan (capt), Justin Tipuric, Morgan Morris.
Replacements: Sam Parry, Garyn Phillips, Ben Warren, James Fender, Morgan Morse, Luke Davies. Owen Williams, Iestyn Hopkins.
Scarlets: Blair Murray; Macs Page, Joe Roberts, Eddie James, Ellis Mee; Ioan Lloyd, Gareth Davies; Alec Hepburn, Ryan Elias, Henry Thomas, Jac Price, Sam Lousi, Vaea Fifita, Josh Macleod (capt), Taine Plumtree.
Replacements: Marnus van der Merwe, Sam O'Connor, Sam Wainwright, Alex Craig, Jarrod Taylor, Efan Jones, Ioan Nicholas, Dan Davis.
Referee: Matthew Carley (RFU)
Assistant referees: Anthony Woodthorpe & Jamie Leahy (RFU)
TMO: David Rose (RFU)