LONDON IRISH v PERPIGNAN (Saturday, 1500, Madejski Stadium)
London Irish (Pool One winners)
Rugby director: Brian Smith.
Captain: Bob Casey.
Cup best: Quarter-finals 2008.
This season: Treviso (h) won 42-9, Dragons (a) won 45-17, Perpignan (h) won 24-16, Perpignan (a) lost 23-6, Dragons (h) won 41-24, Treviso (a) won 24-11.
Top points: 75 - Peter Hewat.
Top tries: Four - Tomas De Vedia, Peter Hewat.
Previous quarter-finals: None.
Player to watch: Nick Kennedy.
Perpignan (Pool One runners-up).
Rugby director: Jacques Brunel.
Captain: Perry Freshwater.
Cup best: Runners-up 2003.
This season: Dragons (h) won 23-19, Treviso (a) won 29-17, London Irish (a) lost 24-16, London Irish (h) won 23-6, Treviso (h) won 55-13, Dragons (a) won 25-0.
Top points: 42 - Cedric Rosalen.
Top tries: Four - Guilhem Guirado.
Previous quarter-finals: Three (won two, lost one).
Player to watch: Percy Montgomery.
GLOUCESTER v MUNSTER (Saturday, 1730, Kingsholm)
Gloucester (Pool Two winners)
Head coach: Dean Ryan.
Captain: Marco Bortolami.
Cup best: Semi-finals 2001.
This season: Ulster (a) won 32-14, Ospreys (h) won 26-18, Bourgoin (a) won 31-7, Bourgoin (h) won 51-27, Ospreys (h) lost 32-15, Ulster (h) won 29-21.
Top points: 73 - Ryan Lamb.
Top tries: Four - Ryan Lamb.
Previous quarter-finals: Two (won one, lost one).
Player to watch: Akapusi Qera.
Munster (Pool Five winners)
Rugby director: Declan Kidney.
Captain: Paul O'Connell.
Cup best: Winners 2006.
This season: Wasps (a) lost 24-23, Clermont Auvergne (h) won 36-13, Llanelli Scarlets (a) won 29-16, Llanelli Scarlets (h) won 22-13, Clermont Auvergne (a) lost 26-19, Wasps (h) won 19-3.
Top points: 83 - Ronan O'Gara.
Top tries: Two - Brian Carney, Marcus Horan, Shaun Payne, Rua Tipoki.
Previous quarter-finals: Nine (won six, lost three).
Player to watch: Ronan O'Gara.
SARACENS v OSPREYS (Sunday, 1230, Vicarage Road)
Saracens (Pool Four winners)
Rugby director: Alan Gaffney.
Captain: Neil de Kock.
Cup best: Quarter-finals 2008.
This season: Glasgow (h) won 33-31, Biarritz (a) lost 22-21, Viadana (h) won 71-7, Viadana (a) won 34-26, Biarritz (h) won 45-16, Glasgow (a) won 21-17.
Top points: 98 - Glen Jackson.
Top tries: Five - Richard Haughton.
Previous quarter-finals: None.
Player to watch: Glen Jackson.
Ospreys (Pool Two runners-up)
Head coach: Lyn Jones.
Captain: Ryan Jones.
Cup best: Quarter-finals 2008.
This season: Bourgoin (h) won 22-15, Gloucester (a) lost 26-18, Ulster (h) won 48-17, Ulster (a) won 16-8, Gloucester (h) won 32-15, Bourgoin (a) won 28-21.
Top points: 84 - James Hook.
Top tries: Three - Sonny Parker.
Previous quarter-finals: None.
Player to watch: Shane Williams.
TOULOUSE v CARDIFF BLUES (Sunday, 1500 BST, Le Stadium)
Toulouse (Pool Six winners)
Head coach: Guy Noves.
Captain: Yannick Jauzion.
Cup best: Winners 1996, 2003 and 2005.
This season: Edinburgh (a) won 19-15, Leinster (h) won 33-6, Leicester (a) lost 14-9, Leicester (h) won 22-11, Leinster (a) lost 20-13, Edinburgh (h) won 34-10.
Top points: 35 - Valentin Courrent.
Top tries: Four - Vincent Clerc.
Previous quarter-finals: Eight (won six, lost two).
Player to watch: Vincent Clerc.
Cardiff Blues (Pool Three winners)
Head coach: David Young.
Captain: Xavier Rush.
Cup best: Runners-up 1996.
This season: Bristol (h) won 34-18, Harlequins (a) drew 13-13, Stade Francais (a) lost 12-6, Stade Francais (h) won 31-21, Harlequins (h) won 23-12, Bristol (a) won 17-0.
Top points: 48 - Ben Blair.
Top tries: Two - Martyn Williams, Jamie Robinson, Maama Molitika.
Previous quarter-finals: None as Cardiff Blues. The Cardiff club side played in four quarter-finals, winning one and losing three.
Player to watch: Martyn Williams.
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