Celtic beat Dutch side Den Bosch 2-0 at St Mirren Park in a friendly match on Wednesday evening.
Gary Mackay-Steven scored early on and an own goal midway through the first half sealed the win for Ronny Deila's team.
Hearts began preparations for their top-flight return with a 2-0 win over Bohemians in Dublin thanks to late goals from Callum Paterson and Soufian El Hassnaoui.
Inverness Caley Thistle won 3-0 away to Highland League champions Brora Rangers and Alloa saw off Lowland League winners Edinburgh City 4-3 at the Indodrill Stadium.
