The towering striker hit a brace from the bench on a memorable debut which drew high praise from most on-lookers.
His half-hour cameo ranks up there with the most promising starts to life in Scotland, but it doesn’t always go so well.
Inspired by the Jambos’ new hero we took a look at some of the best – and some of the worst starts in Scottish football.
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5. Great start
Gary Mackay-Steven: Now the darling of Hearts fans, GMS was quick to endear himself to Celtic support in 2015 - scoring within 38 seconds of his debut. Team-mate Stuart Armstrong followed up with a debut goal of his own.
Photo: SNS Group Sammy Turner
6. Debut disaster
Graeme Souness: The lowest point of his career, he has admitted, was when he trudged off the field at Easter Road, red-carded on his first start as player-manager of Rangers for a horror tackle on George McCluskey. Souness didn't do too badly at Ibrox though.
Photo: SNS Group
7. Great start
Claudio Caniggia: Argentinian made huge headlines when he pitched up at Dens Park and his home debut in 2000 is forever known as 'Caniggia Day' in the City of Discovery. Scored on his club debut than marked his home bow with an audacious lob in defeat to Motherwell.
Photo: SNS Group 0141 221 3602
8. Debut disaster
Chris Iwelumo: Presented with an open goal against Norway and a debut dream - it became a nightmare as the Scotland striker inexplicably side-footed wide with Hampden already celebrating.
Photo: SNS Group Jeff Holmes