Celtic's pursuit of the Premiership title continues on Wednesday night as they look to get things back on track after stumbling at the weekend.
And while they got off with one after dropping points against Hibs, they can seldom afford to give Rangers any more chances.
St Mirren pose an interesting task and they're a much better side than the one that lost 6-0 at Parkhead in the earlier fixture.
Jim Goodwin recovered from that shaky start to turn them into genuine top six contenders and Stephen Robinson is looking to continue that good work.
The Premiership leaders may have to be at their best to get a result and could have hat-trick hero Giorgos Giakoumakis back in the frame.
He missed out against Hibs due to an illness and Celtic missed his physical presence up top. But he could return tonight in the only major change to Postecoglou's squad.
However the manager said at his press conference that he is unlikely to go straight into the starting lineup.
He said: "The squad in general, everyone from the weekend is fine so no changes there.
"Giakoumakis is still 50/50, he's better. We'll probably make a decision tomorrow morning (Wednesday) on him, but if I had to make the call, he probably won't start but might be involved.
"I'll wait and see tomorrow how he's feeling, but he's better. He's almost back."
Predicted Celtic lineup
Celtic squad revealed
Joe Hart
Scott Bain
Christopher Jullien
Greg Taylor
Carl Starfelt
Liam Scales
Cameron Carter-Vickers
Anthony Ralston
Josip Juranovic
Reo Hatate
Nir Bitton
Yosuke Ideguchi
Liel Abada
James McCarthy
Tom Rogic
Matt O'Riley
Callum McGregor
James Forrest
Giorgos Giakoumakis
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