Referees for Europe's Semis

The European Rugby Cup, organisers of the Heineken and Amlin Challenge Cups, has made its match official appointments for the four semifinals.

The Heineken Cup semis are at Twickenham, where Nigel Owens will referee, and at the Vélodrome in Marseilles where Wayne Barnes will referee – both experienced officials.

The Amlin Challenge Cup semis are at Franklin's Gardens with George Clancy and Adams Park with Romain Poite.

In all there are four referees, each from a different country.

Heineken Cup Semifinals

Saracens vs Clermont Auvergne at Twickenham

Referee: Nigel Owens (Wales)

Assistant referees: Alain Rolland (Ireland), Leighton Hodges (Wales)

Television match official: Gareth Simmonds (Wales)

Toulon vs Munster at Stade Vélodrome, Marseilles

Referee: Wayne Barnes (England)

Assistant referees: JP Doyle (England), Luke Pearce (England)

Television match official: Graham Hughes (England)

Amlin Challenge Cup Semifinals

Northampton Saints vs Harlequins at Franklin's Gardens (20.00)

Referee: George Clancy (Ireland)

Assistant referees: John Lacey (Ireland), Marius Mitrea (Italy)

Television match official: Jim Yuille (Scotland)

London Wasps vs Bath at Adams Park

Referee: Romain Poite (France)

Assistant referees: Jérôme Garcès (France), Pascal Gauzère (France)

Television match official: Eric Gauzins (France)