Alan Lewis will referee a record seventh Heineken Cup quarter-final when he takes charge of the match between Saracens and the Ospreys at Vicarage Road on Sunday, 6 April.

The leading Irish official is the only referee to have controlled 50 tournament matches, including nine at the knock-out stages.

While it will be Heineken Cup match No 51 for Lewis, English referee Wayne Barnes will be in charge of his first tournament quarter-final when he goes to Le Stadium to control the tie between Toulouse and Cardiff Blues in the second of the Sunday matches (kick-off 4.00 pm).

On Saturday, 5 April, Alain Rolland (Ireland) will referee his fourth Heineken Cup quarter-final when London Irish meet Perpignan at the Madejski Stadium while Welsh referee Nigel Owens will be in charge of the Gloucester Rugby and Munster showdown at Kingsholm, his second tournament knock-out stage appointment.

HEINEKEN CUP QUARTER-FINALS - (All kick-offs LOCAL times)

SATURDAY 5 APRIL
15.00 London Irish v Perpignan - Alain Rolland (I)
17.30 Gloucester Rugby v Munster - Nigel Owens (W)

SUNDAY 6 APRIL
12.30 Saracens v Ospreys - Alan Lewis (I)
16.00 Toulouse v Cardiff Blues - Wayne Barnes (E)

HEINEKEN CUP SEMI-FINALS (26 / 27 April)
London Irish or Perpignan v Toulouse or Cardiff Blues
Saracens or Ospreys v Gloucester Rugby or Munster

In related news, Tim Hayes will referee the opening European Challenge Cup quarter-final when Sale Sharks clash with Brive at Edgeley Park on Friday, 4 April (kick-off 7.30 pm).

The Welsh referee will be in charge of a match between former European champions as Sale Sharks are chasing a hat-trick of European Challenge Cup titles after lifting the trophy in 2002 and 2005 while Brive won the Heineken Cup in 1997.

Romain Poite (France) will referee the all-England clash between Bath Rugby and Leeds Carnegie, George Clancy (Ireland) will be in charge of the tie between Worcester Warriors and Montpellier while the Newcastle Falcons match against Castres Olympique will be controlled by Peter Allan (Scotland).

EUROPEAN CHALLENGE CUP QUARTER-FINALS - (All kick-offs LOCAL time)

FRIDAY 4 APRIL

19.30 Sale Sharks v Brive - Tim Hayes (W)

SATURDAY 5 APRIL

14.15 Bath Rugby v Leeds Carnegie - Romain Poite (F)
15.00 Worcester Warriors v Montpellier - George Clancy (I)
20.00 Newcastle Falcons v Castres Olympique - Peter Allan (S)

SEMI-FINALS (25 / 26 / 27 April)

Worcester Warriors or Montpellier v Newcastle Falcons or Castres Olympique

Bath Rugby or Leeds Carnegie v Sale Sharks or Brive