"Clean sheets are the foundation you build from," Jagielka told Everton's website http://www.evertonfc.com.
"You want to give your striker the chance to be the match winner. If we can keep it tight at the back, hopefully the forwards will get one or two chances in a game and take them, so the clean sheet is always important.
"Confidence works both ways... "
Everton, who are ninth in the standings, will be gunning for back-to-back away victories for the first time this season when they travel to 15th-placed Swansea City on Saturday.
(Reporting by Aditi Prakash in Bengaluru)
