Rovers fell behind after seven minutes when Urreta squeezed home a shot on the rebound.

But Rovers turned the game on its head in the space of two minutes when Morten Gamst Pedersen's superb free-kick and Jason Roberts both netted shortly after the half-hour mark.

It was 3-1 five minutes after half-time when Brett Emerton threw himself at Pedersen's cross.

Benfica pulled a goal back through Ariza Makukula and saw a shot cleared off the line in the closing stages as Blackburn clung on.