If St Johnstone push Celtic all the way at McDiarmid Park again then Ange Postecoglou will need a new hero this time.
Giorgos Giakoumakis was the Perth saviour last time around with a stoppage strike after the Saints had scored one of their own for what looked like earning them a point.
But Giakoumakis is 4000 miles away putting the finishing touches to his move to Atlanta United so someone else will have to step up if that's what's required again. And that's where new boy Oh could come in. The South Korea star has made quite the impression on his new team-mates and has come off the bench in the last couple of games. The 21-year-old who joined from Suwon Samsung Bluewings was earmarked as a replacement for Giakoumakis when it became clear the Greek was leaving but it's big boots to fill.
