Toulon v Leinster
Leinster are the only GUINNESS PRO12 side in European action on Sunday but what a titanic tussle it promises to be.
The Irish province head to Toulon to take on the three-time defending champions at the Stade Felix Mayol and head coach Leo Cullen knows his side have to win.
Two defeats from their first two games mean Leinster are staring down the barrel of a pool stage exit and tests do not come much tougher.
One look at the Toulon backline is enough to let you know how hard it will be with World Cup winners and international class everywhere you look.
These teams have faced each other twice before with Toulon taking the spoils on both occasions, although they've never clashed before in the pool stage.
Toulon have played 35 matches in the Champions Cup and lost consecutive games only once, however after defeat to Wasps last time out they will be aiming to avoid back-to-back defeats for the first time since 2011.
Leinster have suffered three consecutive losses in the Champions Cup but have never lost four in a row in their previous 138 games in the competition.
Sunday December 13th, 16:15
Toulon: Toulon: 15 Delon Armitage, 14 Bryan Habana,13 Mathieu Bastareaud, 12 Ma'a Nonu, 11 Drew Mitchell, 10 Matt Giteau, 9 Eric Escande, 1 Florian Fresia, 2 Guilhem Guirado, 3 Matt Stevens, 4 Samu Manoa, 5 Romain Taofifenua, 6 Mamuka Gorgodze, 7 Steffon Armitage 8 Duane Vermeulen
Replacements: 16 Anthony Etrillard, 17 Xavier Chiocci, 18 Levan Chilachava, 19 Juan Smith, 20 Tom Taylor, 21 Maxime Mermoz, 22 Anthony Meric, 23 Jocelino Suta
Leinster: 15 Rob Kearney, 14 Fergus McFadden, 13 Ben Te'o, 12 Luke Fitzgerald, 11 Isa Nacewa , 10 Johnny Sexton, 9 Isaac Boss, 1 Cian Healy, 2 Richardt Strauss, 3 Mike Ross, 4 Devin Toner, 5 Mike McCarthy, 6 Rhys Ruddock, 7 Josh Van Der Flier, 8 Jamie Heaslip
Replacements: 16 Sean Cronin, 17 Jack McGrath, 18 Martin Moore, 19 Tom Denton, 20 Jordi Murphy, 21 Eoin Reddan, 22 Ian Madigan, 23 Dave Kearney
To buy tickets for the GUINNESS PRO12 Grand Final click here. Also follow us on Facebook, join the conversation on Twitter, sign up to our YouTube channel for extensive match highlights and sign up for our newsletter for regular updates on the GUINNESS PRO12.