Celtic manager Martin O'Neill tells TNT Sports: "Last thing you want to do is concede so early on. We could've capitulated, but I thougt the second-half performance was terrific. We created chance after chance. "The second-half performance gives me the determination... I think we can still qualify. We can still do it. "We came roaring back, the subs came on and did brilliantly. We could've scored a number of goals. It changed because two wide players really wanted to get at people. "I accept on the break they could have scored themselves, as they did with their fourth goal." When asked if he will take his side's second-half showing into Sunday's encounter with Hearts, he responds: "Absolutely."