Let's talk defense. Here's a list of players I think could slot in immediately
Matthew 'Matt' Mills
28 year old CB
Plays for Bolton in the English championship. By no means a world beater but he would be a solid experienced addition. He was signed with City for a few years and maybe he's willing to try a new league for w change.
Brede Hangeland
33 year old CB
Plays fors Crystal Palace in the Premier League
Born in Houston, Texas with 89 caps for the Norweigan national team. A little older but he's healthy and experienced so why not?
Stefan Strandberg
24 year old CB
Plays for Rosenborg in Norway (Mix's old team)
Could be nice to have someone who has played with Mix on the field working with him. With Mix being played as a CDM it would be a great pairing for years to come.
All of them are available on free transfers this summer.