Celtic boss Martin O'Neill: "I think these games show you that we have obviously a lot of work to do in that aspect [squad depth]."These games are real, real tests for you and unfortunately we've failed that test tonight."I'm responsible for this one but I don't know what's happened in the past."Without a doubt. Naturally it took me a long time to get over the UEFA Cup final in 2003 but this was majorly disappointing. In the context of things, one was a final which it would have been terrific to