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.
Liel Abada started that day and the Israeli could get the nod again if Postecoglou decides to switch it up in the wings, with Daizen Maeda possibly dropping out from the team that started the win against Livingston and Jota back on the left.
Anthony Ralston has trained all week but will not return to playing until the following weekend. Keeper Benjamin Siegrist remains sidelined.
Saints on-loan Celtic defender Adam Montgomery is unable to play against his parent club. Ryan McGowan is out injured while Murray Davidson and Chris Kane are getting closer to a comeback.
Predicted Celtic XI
Provisional Celtic squad
Goalkeepers
Joe Hart
Scott Bain
Defenders
Yuki Kobayashi
Cameron Carter-Vickers
Alexandro Bernabei
Alistair Johnston
Greg Taylor
Stephen Welsh
Carl Starfelt
Midfielders
Reo Hatate
Aaron Mooy
Matt O’Riley
Callum McGregor
David Turnbull
Tomoki Iwata
Forwards
Liel Abada
James Forrest
Kyogo Furuhashi
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