Would a graduate player like Tananga actually be all that bad as one of 4 CB's? We should always aim to have 3 of the best we can get and the best of one of our own in that position. Concentrate on our best two this season and see can grab that 4th spot.
Tanganga could be great as one of the CBs next season (although, let's be honest, likely as a rotation option than a starter at this point in time) but the issue is that we could be alarmingly light of starter-worthy centre backs if Verts and Toby are both free agents next summer because, while we clearly signed Sanchez for this eventuality, after that the issues arise
Foyth - was initially signed for similar reasons to Sanchez, but with us and the Argentine national team moving him to right back that says a lot
Eric Dier - while he says be prefers being a CB he's played as a midfielder for the past four years
Ben Davies - can play CB, as he's shown for Wales and on occasion for us last seaosn, but this would leave us light at left back
Japhet Tanganga - looked impressive in pre-season, but untested as a PL-level starter
Cameron Carter-Vickers - inconsistent in two seasons of Championship loans, so this season's loan to Stoke will be crucial
TJ Eyoma - Poch rates him, but his injury in pre-season means Tanganga's leapfrogged ahead of him
At the very least we need one starter-worthy centre back brought in, but who? At a guess, we'll be hearing the following names linked, not least because most of them have been linked with us in the past two seasons...
Jonathan Tah (Leverkusen)
Joachim Andersen (Lyon, I bet they'll be happy...)
Ozan Kabak (Schalke)
Nikola Milenkovic (Fiorentina)