Celta Vigo coach Eduardo Berizzo believes keeping a clean sheet at home in their Copa del Rey match against Atletico Madrid will be key to their chances of progressing.
The Galicians, who last reached the semi-finals of the tournament in 2000-01, will host Diego Simeone's Atleti in the first leg of their quarter-final tie at Balaidos on Thursday.
It will be the second time in the space of a couple of weeks that the two teams meet as Atletico claimed a 2-0 away win in La Liga on January 10.
Good news for Celta though is they head into the match on the back of 4-2 come-from-behind victory over Levante over the weekend while Atleti were 3-0 winners away to Las Palmas.
Berizzo says it will be important not to concede any away goals on Thursday.
"It will be a tough, tough game. We must be very careful because goals conceded have great significance," he told FourFourTwo.com.
"You have to know the tie does not just take place in Vigo, but at the Vicente Calderon in seven days too.