It will be broadcast live on Viaplay following their coverage of Dundee v Inverness Caledonian Thistle, kick-off 3.00pm.
The eight seeded clubs in the draw will be European representatives Celtic, Rangers, Aberdeen, Heart of Midlothian and Hibernian, plus the three group winners with the best records.
Second-round ties are scheduled for the weekend of August 19/20 and are subject to TV selections.
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