Aberdeen hit back to draw 1-1 with Ross County at the Global Energy Stadium on Tuesday night.
The result means Celtic have the chance to clinch the Premiership title if they can beat Partick Thistle at Firhill on Wednesday.
Melvin De Leeuw gave Derek Adams' side the lead with a first-half header but Adam Rooney equalised with 13 minutes left. Dons defender Andy Considine saw red late on.
Steven MacLean got the only goal as St Johnstone beat St Mirren 1-0 in Paisley to move to within four points of fifth-placed Caley Thistle and leave Saints in the relegation play-off place.
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