Round 1 - 5/6/7 December, 2003.POOL 1: Stade Francais v Leicester Tigers; Gwent Dragons v Ulster. POOL 2: Leeds Tykes v Neath/Swansea; Edinburgh Rugby v Toulouse. POOL 3: Sale Sharks v Cardiff Blues; Leinster Lions v Biarritz Olympique. POOL 4: SU Agen v The Borders; Llanelli Scarlets v Northampton Saints. POOL 5: Bourgoin v Munster; Benetton Treviso v Gloucester. POOL 6: Celtic Warriors v Ghial Amatori & Calvisano; London Wasps v Perpignan.
Round 2 -12/13/14 December. POOL 1:Leicester Tigers v Gwent Dragons; Ulster v Stade Francais. POOL 2: Neath/Swansea v Edinburgh Rugby; Toulouse v Leeds Tykes. POOL 3: Cardiff Blues v Leinster Lions; Biarritz Olympique v Sale Sharks. POOL 4: The Borders v Llanelli Scarlets; Northampton Saints v SU Agen. POOL 5: Munster v Benetton Treviso; Gloucester v Bourgoin. POOL 6: Ghial Amatori & Calvisano v London Wasps; Perpignan v Celtic Warriors.
Round 3 - 9/10/11 January, 2004. POOL 1: Gwent Dragons v Stade Francais; Ulster v Leicester Tigers. POOL 2: Edinburgh Rugby v Leeds Tykes; Toulouse v Neath/Swansea. POOL 3: Leinster Lions v Sale Sharks; Biarritz Olympique v Cardiff Blues. POOL 4: Llanelli Scarlets v SU Agen; Northampton Saints v The Borders. POOL 5: Benetton Treviso v Bourgoin; Gloucester v Munster.
Round 4 - 16/17/18 January. POOL 1: Stade Francais v Gwent Dragons; Leicester Tigers v Ulster. POOL 2: Leeds Tykes v Edinburgh Rugby; Neath/Swansea v Toulouse. POOL 3: Sale Sharks v Leinster Lions; Cardiff Blues v Biarritz Olympique. POOL 4: SU Agen v Llanelli Scarlets; The Borders v Northampton Saints. POOL 5: Bourgoin v Benetton Treviso; Munster v Gloucester.POOL 6: Celtic Warriors v London Wasps; Ghial Amatori & Calvisano v Perpignan.
Round 5 - 23/24/25 January. POOL 1:Stade Francais v Ulster; Gwent Dragons v Leicester Tigers. POOL 2: Leeds Tykes v Toulouse; Edinburgh Rugby v Neath/Swansea. POOL 3: Sale Sharks v Biarritz Olympique; Leinster Lions v Cardiff Blues. POOL 4: SU Agen v Northampton Saints; Llanelli Scarlets v The Borders. POOL 5: Bourgoin v Gloucester; Benetton Treviso v Munster. POOL 6: Celtic Warriors v Perpignan; London Wasps v Ghial Amatori & Calvisano.
Round 6 - 30/31 January/1 February. POOL 1:Ulster v Gwent Dragons; Leicester Tigers v Stade Francais. POOL 2: Toulouse v Edinburgh Rugby; Neath/Swansea v Leeds Tykes. POOL 3: Biarritz Olympique v Leinster Lions; Cardiff Blues v Sale Sharks. POOL 4: Northampton Saints v Llanelli Scarlets; The Borders v SU Agen. POOL 5: Gloucester v Benetton Treviso; Munster v Bourgoin. POOL 6: Perpignan v London Wasps; Ghial Amatori & Calvisano v Celtic Warriors.
Heineken Cup quarter-finals: 9/10/11 April.
Heineken Cup semi-finals: 24/25 April.
Heineken Cup final: 22/23 May 2004.