O'Neill 'not sure what to make of' Celtic, so what are issues?

Martin O'Neill was perplexed in Perth.His "laborious" Celtic side made it six wins out of six in the Scottish Premiership by sneaking by St Johnstone, but his much-changed side far from had it all their own way.After handing a debut to on-loan Wolves goalkeeper Sam Johnstone, a first Celtic start to midfielder Oliver Sorensen and a rare run-out for centre-back Dane Murray - in addition to recalling winger Sebastian Tounekti and striker Kasper Hogh - the veteran manager would have hoped to have h