Northampton have advanced to the last four of rugby's Heineken Cup with a well-deserved 23-13 home victory over Ulster on Monday to make it three wins out of three for the home teams in the quarter-finals so far.
Northampton, who won all six pool games to go into the last eight as top seeds, will have home-country advantage in their semi-final against Perpignan who beat Toulon 29-25 in Barcelona on Sunday.
Perpignan chose to take the tie to Barcelona because they consider themselves as Basques.
In a repeat of last year's final defending champions Toulouse beat fellow French Club Biarritz 27-20 in extra time in the final quarter-final in San Sebastian on Monday.
Toulouse now meet Leinster in Dublin in the second semi-final following the Irish team's 17-10 home win over Leicester on Sunday.