I’m an optimist, but I still think both Dier and Sanchez can be effective PL defenders, but they need a no1 option alongside them to do it consistently. Reminds me of Dawson, great when King was there to organise and cover, not so much on his own. Hopefully that no1 is Romero, but we shouldn’t forget Dier has been a full time centre half for one season, be good to see what a proper coach can do with him.