All 12 cinch Premiership sides are in action on Wednesday evening, with leaders Celtic away to Hibernian, live on Sky Sports kick-off 8.00pm.
Ange Postecoglou's men have a nine-point lead at the top of the table, with closest challengers Rangers at home to Motherwell this midweek.
There are only two points between third-placed Aberdeen and Livingston in eighth place. The Dons travel to play Kilmarnock at Rugby Park, Heart of Midlothian take on St Johnstone at McDiarmid Park and St Mirren head for West Lothian to face Livingston.
There's a huge game at Tannadice, where bottom club Dundee United host a Ross County team one place and two points above them in the table.
