Celtic have controlled the landscape of domestic football in Scotland for over the last decade and have started the season in strong fashion once again. The Bhoys came flying out the blocks last Sunday on the opening day of the Scottish Premiership, disposing of Kilmarnock in comfortable fashion to move top of the pile. With the campaign in its infancy, Celtic fans will always be on the lookout to see how other sides have strengthened this summer. Some firm challenges will stand in the Bhoys’ way as they look to record four in a row, not least the prospect of facing last term’s third-place sid…