I dunno really, there's lots of good options. Badiashile, Tapsoba, Ndicka, Bade, White, Kamara and the list goes on. Transfer committee/scouting at the club should be able to sift through every minute these guys have played this year and find the next Fofana, Kounde, Dias etc, which we aren't paid to do.
I do think we'll be in for Anderson. He's a good player, but we've all seen his issues in recent weeks when Fulham play higher up the field, and some of his general awareness issues. White, Tapsoba and Kamara (played as dm this year) all defend well and use the ball well, and carry the ball into space which is something we're crying out for at the back imo.
New manager might play three at the back, which will need to be taken into consideration as well. I dunno, it's all up in the air, let's hope for the best.