Goalkeeper Coach Darryl Flahavan and Head of Physical Performance Sean Rush both left Blues yesterday.
James Beattie has also departed his role as First Team Coach.
Flahavan, Rush and Beattie all joined Blues in March 2018, bringing fresh impetus and helping the team consolidate to become a very competitive Championship side.
Flahavan's training methods and technical expertise were always well received by the goalkeepers under his direction whilst Rush, working closely with the medical and sports science department, brought about an upturn in the squad's physical conditioning, durability and mentality.
Beattie's input on the coaching field was also important as part of the overall backroom set-up.
The trio also served the Club professionally when staying on during testing circumstances last summer after Pep Clotet was appointed Interim Head Coach.
Blues would like to thank Darryl, Sean and James most sincerely for all their efforts and they leave on good terms with our best wishes for the future.