Brendan Venter has urged Saracens to find the finishing touch in Saturday's Heineken Cup clash against Irish heavyweights Leinster at Wembley.
Saracens were left frustrated by their try-scoring failures during last weekend's Pool Two appointment with French champions Clermont Auvergne. Wing David Strettle's second-half touchdown apart, the Aviva Premiership club were guilty of frittering away gilt-edged opportunities as they crashed to a 25-10 defeat.
And rugby director Venter warned: "If we don't finish our chances against Leinster, we won't beat them. They are too classy an outfit."
He added: "We created a lot against Clermont, so many try-scoring opportunities, but with a lot of them it was us that actually made the error.
"We need to finish on Saturday, we need to take our points. Give Leinster a half-chance, and they score."
Saracens are already five points behind Leinster in the race for quarter-final places, which underlines why Venter's men cannot afford to slip up in front of an anticipated 40,000 Wembley crowd.
Their task, though, might have been made marginally easier due to Ireland midfield star Brian O'Driscoll being sidelined because of a hamstring injury suffered during Leinster's impressive victory over Racing Metro last Saturday.
Luke Fitzgerald will forge the centre partnership alongside Gordon D'Arcy, while Saracens restore lock Mouritz Botha and number eight Ernst Joubert to their starting line-up.