Our centre-backs are:
Svensson - very experienced, though obviously a massive injury worry
Perry - 35, very experienced.
Thomas - 29, experienced old head.
Cork - youngster but made a significant number of appearances at this level.
Not many teams will have more than 4 recognised centre-halves they can call on, and that's ignoring the fact that Wotton started his career as a centre-back, and the younger kids who are available.
Even if you discount Svensson, Perry and Thomas would surely be counted as experienced in position. I'm not sure I understand exactly how many of these players you think we need.