I thought Steven Taylor whose a free agent for competition for Delaney but I'm not sure about better defenders within are budget. I still wish for Gibbs though.

Niklas sule 20 yrs old plays for hoffenheim and is a monster,
Dominic iorfa at Wolves,
Paddy McNair at manure ? Jose supposedly doesn't like youth and with them having a few CBs why not.

As for lb I like Marcos alonso played well this year.
Ben Davies at Tottenham would be good if he played week in week out. Plus a few Welsh mates at palace already.
Nathan ake on loan maybe, or Kieran Gibbs if he wants first team football.