Moritz Jenz headed a late debut goal as Celtic were again made to work in Dingwall as they beat Ross County 3-1. Kyogo Furuhashi gave Celtic the lead in the 48th minute, but Alex Iacovitti levelled with Ross County’s first effort on target 10 minutes later. Malky Mackay’s side looked like they might frustrate their visitors but Jenz ran in to meet Jota’s inswinging cross and head into the roof of the net from six yards in the 84th minute. Substitute Liel Abada wrapped up a 3-1 win in stoppage-time when he curled home from 18 yards. Alfredo Morelos returned to action after a five-month absence to score the clinching goal in Rangers’ 2-0 win over Kilmarnock at Ibrox. Gers lost 2-0 away to Union SG in the first leg of their Champions League qualifier on Tuesday and a laboured first half disappointed. Antonio Colak lifted Rangers’ spirits when he fired in his first goal in the 51st minute and there was more good news for the Gers faithful when Colombia striker Morelos, out since March due to a thigh injury, came off the bench after the hour mark before sealing the win in the 88th minute with a close-range finish. Stevie May scored a dramatic winner deep into injury time as St Johnstone secured a 2-1 victory over Motherwell at Fir Park. Jamie Murphy gave the visitors the lead in the first half, before Motherwell thought they had secured a point as Sean Goss’ corner found its way into the net in the 90th minute, with Sondre Solholm Johansen wheeling away in celebration. There was to be an even later twist, however, as May ran on to Ryan McGowan’s header to slide in a cute finish and seal the points. Aberdeen blew St Mirren away 4-1 at Pittodrie after an early red card for the visitors opened the flood gates. The Dons grabbed three first-half goals thanks to a Bojan Miovski double and one from Leighton Clarkson on the stroke of half-time. Jonah Ayunga scored a consolation for the Saints as Duk rounded off the easy win for Aberdeen in the 87th minute.