Martin O’Neill understands any anxiety affecting fans as the January transfer window approaches its end but insists Celtic are “making strenuous efforts” to improve the team. “I don’t know whether, there’s an anger there, if you’re telling me that’s there, then I’ll take your word for it. “I’m confident, reasonably confident that we can do. I’m reasonably confident we can do it. Lots of names have been put forward – lots of people I’ve taken an interest in, one or two have been thwarted.