If Liverpool’s first preseason under Andoni Iraola has underscored anything, it’s their defensive struggles. Last season under Arne Slot, a lack of depth and quality resulted in one of the club’s leakiest campaigns in modern history. However, there remain concerns over the caliber of Liverpool’s defensive unit, and Iraola has some tough calls to make come the club’s Premier League opener away at Newcastle United. Liverpool’s Best Defense As Things StandLiverpool need a big season from Van Dijk (L) and Kerkez. | Gaspafotos/MB Media/Getty ImagesThere are simply no questions over Liverpool’s best goalkeeper.