Kyogo Furuhashi's late first-half strike gave Celtic a crucial 1-0 cinch Premiership win over Rangers at Ibrox as former Shamrock Rovers defender Liam Scales starred at the heart of defence.The Light Blues had the ball in the net twice in the first half but on both occasions the 'goals' were not allowed to stand - offside and a foul picked up by VAR - but Furuhashi could have scored twice himself before he fired the visitors in front just before the break.There were no travelling supporters - Celtic rejected the offer of around 700 tickets, citing safety concerns - but that seemed to hinder rather than help the home side at times as they tried in vain to get back on level terms.After just four league fixtures, leaders Celtic are already four points ahead of their Old Firm rivals going into the international break and the spotlight will be on manager Michael Beale, who must have heard the boos ring out at the final whistle as pressure grows on his position.For Celtic boss Brendan Rodgers, who was under some scrutiny himself after his team lost to Kilmarnock in the Viaplay Cup and then drew at home to St Johnstone, it was a return to the overwhelmingly positive derby results he enjoyed in his first spell as Parkhead boss.Scales has been brought in for the cold in the wake of injury problems for the Hoops.He recorded 10 clearances and three interceptions as part of a disciplined performance which kept Rangers out.The home side had been knocked out of the Champions League qualifiers by PSV Eindhoven in midweek on a 7-3 aggregate, a result which brought the doom-mongers back to Beale's door.Dujon Sterling took over from the injured left-back Borna Barisic in Rangers' line-up while midfielder Ryan Jack and striker Kemar Roofe