Marseille, Dublin or London to host Heineken Cup semi-finals

Toulon will host their Heineken Cup semi-final in Marseille if they beat Leinster on Sunday.
The 41,000-seat Stade Vélodrome could become the 105th venue to stage Heineken Cup action but if the reigning champions lose to the Irish side the semi-final will be staged at Dublin's Aviva Stadium against either Munster or Toulouse on Sunday April 27.
The first semi-final could also be staged in Dublin if Ulster overcome Saracens on Saturday but, if the Premiership leaders win, they will return to Twickenham for their second consecutive Heineken Cup semi-final there.
Heineken Cup semi-finals
Saturday, 26 April
Ulster v winners Clermont  v Leicester , Aviva Stadium, Dublin
OR
Saracens v winners Clermont v Leicester , Twickenham Stadium
Sunday, 27 April
Toulon v winners Munster v Toulouse, Stade Vélodrome, Marseille
OR
Leinster v winners Munster v Toulouse, Aviva Stadium, Dublin
Final: Saturday, 24 May; Millennium Stadium