http://www.boxingscene.com/kirklands-return-targeted-late-october-november--53515

Here is the source. I think it's fair enough if he's not fit, he's not fit. This is the biggest fight of his career and highly risky, it's not worth the risk if he's not fit and he mentally won't be up for it, with the risk of making the injury worse.

It's better pulling out early than late IMO.